物竞天择 natural selection
例句：The pressure of natural selection is An irresistible force shaping all of nature.
物竞天择的法则是一种不可抗拒的造就自然界的力量,
永无止境
例句：And forever has no end.永永远远,永无止境.
物竞天择 natural selection
例句：The pressure of natural selection is An irresistible force shaping all of nature.
物竞天择的法则是一种不可抗拒的造就自然界的力量,
永无止境
例句：And forever has no end.永永远远,永无止境.