There were two things that he thought were too difficult for him—the grammar and some of the idioms.
他认为有两件事对他来说太困难了，一是语法，二是一些习语。
Tom's lessons were too difficult for him and before long he fell behind the rest of the class.
汤姆的课程对他来说太难，不久他就落后于班上的其他同学。
Tom's lessons were too difficult for him and before long he fell behind the rest of the class.
汤姆的课程对他来说太难，不久他就落后于班上的其他同学。
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