firm商行，公司。
He is working for a big firm.
abroad在国外
a great number of +可数名词 表示多数的
a great many +可数名词
eg: a great many people
a great amount of money 跟不可数
have been to someplace.去过某个地方(现在已经回来了)
have gone to someplace 去了某个地方(现在还没回来)
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