instinct

n. natural habit of behaving in a particular way, without thinking and without having been taught
本能，天性
As winter approaches, birds fly south from Canada by instinct.
當(dāng)冬天來(lái)臨時(shí)，鳥(niǎo)兒出于本能會(huì)離開(kāi)加拿大，飛往南方。

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