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。
Get him involved: This finance lesson to teach your son involves sitting down with him and drawing two columns on a blank piece of paper.
让他参与进来：这堂课要让你的孩子与你一起坐下来，在空白纸上画出两列。
The chief lesson this teaches us is that making new equipment affordable has become a major problem in the research and development (R&D) process of any major new piece of military hardware.
这给我们的主要教训就是：能承受新装备的开销已成为研究开发军事新硬件设施过程中的主要问题。
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