habit [ˈhæbɪt]

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n.习惯，癖好，恶习，毒瘾；服装，衣服

something which you do often and regularly , sometimes without knowing that you are doing it

It's a good habit to wash up before a meal. 饭前洗手是好习惯。
It is not easy to get out of a bad habit. 改掉坏习惯是不容易的。