正如我们大家所知，他学习很努力。
正如我们大家所知道的那样，生物必须有适量的氧气。氧气太多，生物会烧死；氧气太少，生物会窒息而死。
Living things, as we know them, must have just right amount of oxygen, too much, and they would burn too little, and they would die.
正如我们大家所知道的那样，生物必须有适量的氧气。氧气太多，生物会烧死；氧气太少，生物会窒息而死。
Living things, as we know them, must have just right amount of oxygen, too much, and they would burn too little, and they would die.
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