问题描述：
one would expect them to know their parts by heart and never have cause to falter.yet this is not always the case.
这句话里的one would expect them to know their parts by heart里面有固定搭配吗 by heart是什么用法
还有yet this is not always the case该怎么理解呢 因为我按照这句话的意思翻译出来觉得有点奇怪
这句话里的one would expect them to know their parts by heart里面有固定搭配吗 by heart是什么用法
还有yet this is not always the case该怎么理解呢 因为我按照这句话的意思翻译出来觉得有点奇怪
问题解答：
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