The supported units are based on the SI units specified in the UNECE/CEFACT Trade Facilitation Recommendation No. 20 standard. (http://www.unece.org/fileadmin/DAM/cefact/recommendations/rec20/rec20_Rev12e_2016.xls) (See: Units)
Since the number of all sectors and quantities is very large, only selected sectors and quantities are displayed be default.
To display all the units, you must click on "Show All Units" 
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支持的单位是基于 UNECE/CEFACT Trade Facilitation Recommendation No. 20 标准中规定的SI单位 。(http://www.unece.org/fileadmin/DAM/cefact/recommendations/rec20/rec20_Rev12e_2016.xls)(见： 单位)
由于所有sectors和quantities的数量非常大，所以默认只显示选定的部门和数量 。
要显示所有单位，你必须点击 "Show All Units " 。
重要提示： 打开/关闭Show all units 的选项，会取消选择的单位。