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In the first place, extra stud ie s bring about unhealthy impacts on physical growth of children.

首先，额外的学习对孩子们的身体发育是不利的。

We can perhaps forgive those who said the moons of Jupiter were produced by Galileo's spy-glass if we recall that in his day, as for centuries before, curved glass was the popular contrivance for producing not truth but illusion, untruth; and if a single curved glass would distort nature, how much more would a pair of them?

如果我们回忆一下，Galileo时代如同它的几个世纪以前一样，曲面镜不是用来产生真像而是产生幻影或假像的常用器械，那么，对于那些把木星的卫星说成用Galileo小望远镜产生出来的人们，我们或许会予以原谅的；如果一面曲面镜会歪曲大自然，那么一对曲面镜将会造成多大的歪曲呢？