1 他们发现要掌握一门外语是困难的。 （find it difficult to）
They find it difficult to learn a foreign language
2 这所学校平均每个班有45人。（on the average）
Every class of this school has forty-five students on the average
3 请你把你要的东西清理出来并把其余的全扔掉。 （sort out）
Please sort out all you want and throw away the rest
4 他被认为是我们当中跑得最快的人。（supposed to）
He is supposed to run fast among us
5 互相理解对友谊是至关重要的。 （of…importance to）
Mutual understanding is of great importance to a friendship
有不会的可以再问我
have difficulty in doing sth= cannot do sth; hard to do sth; be difficult for sb to do sth
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