这是他最困难的时期。
幸运的是，通过自己的努力，她已经度过了最困难的时期。
Fortunately, through her own hard work, she had now got through the most difficult time.
在少年时代最困难的时期就是我的朋友都成双入对了，而我只能埋头于书本。
And there were difficult periods during my mid-teens when my friends started to couple up, while I kept my head in the books.
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