second nature
US /ˈsɛkənd ˈneɪtʃər/
UK /ˈsɛkənd ˈneɪtʃər/
1.
轻车熟路, 第二天性
an acquired habit or skill that is so deeply ingrained as to appear instinctive
:
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After years of practice, playing the piano became second nature to her.
经过多年的练习，弹钢琴对她来说已是轻车熟路。
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For a seasoned chef, chopping vegetables is second nature.
对于经验丰富的厨师来说，切菜是轻而易举的事。