Physics

ISBN: 9781330269794 出版年：2016 页码：164 Balfour Stewart Forgotten Books

In fact you have been told about the various kinds of things we have in the world, but you have not yet learned much about the affections or moods of these things. You are yourself subject to change of moods; sometimes you appear with a smile on your face, and sometimes, perhaps, with a face full of frowns or tears sometimes, again, you feel vigorous and active sometimes dull and listless.