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疫苗的安全性和有效性是其研发中最重要的标准。
The best way to create interest in a subject is to render it worth knowing, which means to make the knowledge usable.
When you change the way you look at things, the things you look at change.
For the eyes of the world now look into space, to the moon and to the planets beyond, and we have vowed that we shall not see it governed by a hostile flag of conquest, but by a banner of freedom and peace.