what do you call this in english .its a stamp .it______sending letters

what do you call this in english .its a stamp .it______sending letters
a is used to b is used for 为什么选 b
而computer are used to control not only the speed but also the direction of the spaceships是用used to
英语人气:437 ℃时间:2019-08-28 08:51:32
优质解答
固定搭配 be used to do sth be uesd for doing sth
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