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.
在长官或长辈面前，说话的声音要降低。
When talking in front of our elders, we should lower our voice.
在长官或长辈面前，说话的声音要降低。
When talking in front of our elders, we should lower our voice.
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