拼音：yōu sh è ng lè tài
解释：优：优良；汰：淘汰。指生物在生存竞争中适应力强的保存下来，适应力差的被淘汰。
单字解释： 优 胜 劣 汰
Excellent: excellent; Elimination: elimination. It refers to the survival of organisms with strong adaptability in the survival competition, and the ones with poor adaptability are eliminated.
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