很多外语种学生在单词重音和语调方面存在学习难题，也就是对人们说话时的声音的升高和降低把握不准。

Many students of a foreign language have trouble with word stress and intonation - raising and lowering the sound of your voice when you speak.

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重音是最主要的韵律特征之一，重音在声学上主要表现为音高的升高和时长的延长。

As one of the leading prosodic features, the accent indicates an ascendence of the phonetic pitch and a lengthening of the temporal length.

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