Certificate of quantity
[經] 數量證明書
?? 詞語組成解析
certificate
[s?'t?f?k?t]
n. 證明書;文憑，結業證書;
vt. 發給證明書;用證書證明（或認可）;
cert 搞清 + ifi=fy表動詞 + cate表名詞 → certify搞清楚=證明+ cate表名詞 → 證件
of
[?v]
prep. 關于;屬于…的;由…制成;
aux. 助動詞 [非標準用語、方言] =have [主用于虛擬語氣];
??? 情景例句
If you're not sure, then the answer should probably be no.
如果你不確定，那么答案可能就是“不”了。
But you have to pay 5% commission on this money exchange.
但兌換這筆外幣，您得另外付5%的手續費。
Education, with its cycles of instruction so carefully worked out,
教育，以其教學周期如此精心地安排，