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1·I only do it out of habit.

我这么做只是出于习惯。《牛津词典》

2·Many people add salt to their food out of habit, without even tasting it first.

许多人出于习惯往他们的食物中加盐，甚至都不先品尝一下。《柯林斯英汉双解大词典》

3·We say, I love you to our parents or significant other when we hang up the phone, not because we mean it, but out of habit.

我们会在挂电话时和父母或者某个重要的人说“我爱你”，不是因为我们真的想这么说，而是因为习惯。

4·We stayed together out of habit.

我们出于习惯待在一起。

5·Or was it just out of habit?

那或许只是习惯。

6·I do it only out of habit.

我做这件事只是出于习惯。

7·I smoke out of habit, not for pleasure.

我吸烟出于习惯，不是为了乐趣。

8·I currently check my stats once a day out of habit.

出于习惯，我目前每天察看一次网站统计。

9·Don't scold him. He did this totally out of habit.

不要批评他了。他这么做完全是出于习惯。

10·I didn't mean to do it. I did it purely out of habit.

我不是有意那么做的，我那样做纯属习惯。