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If you can't explain your chemistry to a non-scientist, you don't understand it well enough.
写作的行为是一种生存的行为。
It is our mission as scientists of this generation to ensure Chinese people have enough to eat.
轻易不动感情的人,一旦动情,就会地裂山崩,把自己燃烧成一堆灰烬,被他爱上的人,也会被这狼烟烈火烧烤得痛不欲生。