Microsoft Azure 的 sign up， country 选项里只有 Taiwan 没有 China

<option value="AL">Albania</option>
<option value="DZ">Algeria</option>
<option value="AO">Angola</option>
<option value="AR">Argentina</option>
<option value="AM">Armenia</option>
<option value="AU">Australia</option>
<option value="AT">Austria</option>
<option value="AZ">Azerbaijan</option>
<option value="BS">Bahamas</option>
<option value="BH">Bahrain</option>
<option value="BD">Bangladesh</option>
<option value="BB">Barbados</option>
<option value="BY">Belarus</option>
<option value="BE">Belgium</option>
<option value="BZ">Belize</option>
<option value="BM">Bermuda</option>
<option value="BO">Bolivia</option>
<option value="BA">Bosnia and Herzegovina</option>
<option value="BW">Botswana</option>
<option value="BR">Brazil</option>
<option value="BN">Brunei Darussalam</option>
<option value="BG">Bulgaria</option>
<option value="CV">Cabo Verde</option>
<option value="CM">Cameroon</option>
<option value="CA">Canada</option>
<option value="KY">Cayman Islands</option>
<option value="CL">Chile</option>
<option value="CO">Colombia</option>
<option value="CR">Costa Rica</option>
<option value="CI">Côte D'ivoire</option>
<option value="HR">Croatia</option>
<option value="CW">Curaçao</option>
<option value="CY">Cyprus</option>
<option value="CZ">Czech Republic</option>
<option value="DK">Denmark</option>
<option value="DO">Dominican Republic</option>
<option value="EC">Ecuador</option>
<option value="EG">Egypt</option>
<option value="SV">El Salvador</option>
<option value="EE">Estonia</option>
<option value="ET">Ethiopia</option>
<option value="FO">Faroe Islands</option>
<option value="FJ">Fiji</option>
<option value="FI">Finland</option>
<option value="FR">France</option>
<option value="GE">Georgia</option>
<option value="DE">Germany</option>
<option value="GH">Ghana</option>
<option value="GR">Greece</option>
<option value="GT">Guatemala</option>
<option value="HN">Honduras</option>
<option value="HK">Hong Kong SAR</option>
<option value="HU">Hungary</option>
<option value="IS">Iceland</option>
<option value="IN">India</option>
<option value="ID">Indonesia</option>
<option value="IQ">Iraq</option>
<option value="IE">Ireland</option>
<option value="IL">Israel</option>
<option value="IT">Italy</option>
<option value="JM">Jamaica</option>
<option value="JP">Japan</option>
<option value="JO">Jordan</option>
<option value="KZ">Kazakhstan</option>
<option value="KE">Kenya</option>
<option value="KR">Korea</option>
<option value="KW">Kuwait</option>
<option value="KG">Kyrgyzstan</option>
<option value="LV">Latvia</option>
<option value="LB">Lebanon</option>
<option value="LY">Libya</option>
<option value="LI">Liechtenstein</option>
<option value="LT">Lithuania</option>
<option value="LU">Luxembourg</option>
<option value="MO">Macao</option>
<option value="MK">Macedonia, FYRO</option>
<option value="MY">Malaysia</option>
<option value="MT">Malta</option>
<option value="MU">Mauritius</option>
<option value="MX">Mexico</option>
<option value="MD">Moldova</option>
<option value="MC">Monaco</option>
<option value="MN">Mongolia</option>
<option value="ME">Montenegro</option>
<option value="MA">Morocco</option>
<option value="NA">Namibia</option>
<option value="NP">Nepal</option>
<option value="NL">Netherlands</option>
<option value="NZ">New Zealand</option>
<option value="NI">Nicaragua</option>
<option value="NG">Nigeria</option>
<option value="NO">Norway</option>
<option value="OM">Oman</option>
<option value="PK">Pakistan</option>
<option value="PS">Palestinian Authority</option>
<option value="PA">Panama</option>
<option value="PY">Paraguay</option>
<option value="PE">Peru</option>
<option value="PH">Philippines</option>
<option value="PL">Poland</option>
<option value="PT">Portugal</option>
<option value="PR">Puerto Rico</option>
<option value="QA">Qatar</option>
<option value="RO">Romania</option>
<option value="RU">Russia</option>
<option value="RW">Rwanda</option>
<option value="KN">Saint Kitts and Nevis</option>
<option value="SA">Saudi Arabia</option>
<option value="SN">Senegal</option>
<option value="RS">Serbia</option>
<option value="SG">Singapore</option>
<option value="SK">Slovakia</option>
<option value="SI">Slovenia</option>
<option value="ZA">South Africa</option>
<option value="ES">Spain</option>
<option value="LK">Sri Lanka</option>
<option value="SE">Sweden</option>
<option value="CH">Switzerland</option>
<option value="TW">Taiwan</option>
<option value="TJ">Tajikistan</option>
<option value="TZ">Tanzania</option>
<option value="TH">Thailand</option>
<option value="TT">Trinidad & Tobago</option>
<option value="TN">Tunisia</option>
<option value="TR">Turkey</option>
<option value="TM">Turkmenistan</option>
<option value="UG">Uganda</option>
<option value="UA">Ukraine</option>
<option value="AE">United Arab Emirates</option>
<option value="GB">United Kingdom</option>
<option value="US">United States</option>
<option value="UY">Uruguay</option>
<option value="UZ">Uzbekistan</option>
<option value="VE">Venezuela</option>
<option value="VN">Viet Nam</option>
<option value="VI">Virgin Islands, US</option>
<option value="YE">Yemen</option>
<option value="ZM">Zambia</option>
<option value="ZW">Zimbabwe</option>