The new study is both history lesson and warning, the researchers added.
研究人员补充道，新的研究既是历史的教训，又是对未来的警示。
During this lesson, the teacher took out a frayed book with all the lesson pieces arranged according to difficulty, for choosing a new piece to study.
在女儿的这堂钢琴课上，老师拿出一本吓人的包括所有的按难度排列的钢琴课曲目琴书来选一首上课用的新曲。
Great, we'll study a new dialogue in the next lesson!
好，下面我们来学习几段对话！
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