学习准确的发音——元音发音时长。
如果你想生命之树常绿,你就必须向松柏学习随时长出嫩叶。
If you want evergreen tree of life, you must learn to always grow pine leaves.
时长三个小时的期末考试将覆盖本学期的所有学习内容。
There will be a three-hour final examination covering all material from the entire semester.
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