Habit 加 s 是泛指任何习惯.因为不是一个具体的坏习惯,是普遍的坏习惯

we must cure a child of a bad babits.

habit 习惯的意思

I'm trying to break the habit of staying up too late.

我正试图改掉熬夜的习惯。

I've got into the habit of turning on the TV as soon as I get home.

我习惯了一回家就打开电视。

He always goes to bed at ten ─ he's a creature of habit.

他总在十点钟上床睡觉，是个严守生活习惯的人。