（系表结构 ）窗户现在关着。
方案三放一段卓别林的影片，其中含有不同表情。由此引出表达情感的一系列形容词，进行系表结构的学习。
Let's ask a boy to make some actions without making any sound, and then we watch how he fires firecracker and find some adjectives to express his feelings.
系表结构伽利略的最光辉业绩在于，1609年他第一个把新发明的望远镜对准天空，以证实行星是围绕太阳旋转而不是围绕地球旋转的。
Galileo's greatest glory was that in 1609 he was the first person to turn the newly invented telescope on the heavens to prove that the planets revolve around the sun rather than around the earth.
通过计算结构常数，对三维可解李三系进行了分类，写出了它们的非零乘法表。
Calculating their structure constants, the authors classify the 3 dimensional solvable Lie triple systems and write their multiplication tables for a basis.
通过计算结构常数，对三维可解李三系进行了分类，写出了它们的非零乘法表。
Calculating their structure constants, the authors classify the 3 dimensional solvable Lie triple systems and write their multiplication tables for a basis.
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