be difficult to do是什么意思

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be difficult to do是什么意思
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be difficult to do是什么意思
be difficult to do是什么意思

be difficult to do是什么意思
做……困难

做某事很困难
如 it is difficult to learn english well

be difficult to do sth
做某事是困难的

做……很困难

难做到什么