We shall hammer away at this problem till we get a solution.
我们将努力研究这个问题，直到找出一个解决办法。
That lesson is not easy, but hammer away at it and you will get it right.
那课书不容易，但只要你坚持学，你是会学好的。
If you hammer away at finishing these letters, you can just get them ready in time for the post.
要是你加紧把这些信写完，你就正好能及时把它们寄出去。
If you hammer away at finishing these letters, you can just get them ready in time for the post.
要是你加紧把这些信写完，你就正好能及时把它们寄出去。
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