OUT OF THEIR MINDS

If someone is out of his mind, he has gone mad. 精神失常,,发疯了

虽然同样是"疯狂"的意思,但本条一般不用于乱吵乱闹的情况,而用于神态稳静但头脑异常的场合.

be out of one's mind 与 lose one's mind 同义.

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DOWN-TO-EARTH (adj, apprec)

practical and honest 实际的,脚踏实地的

If somebody is down-to-earth, he will tell you what he really thinks.



ON A DIET

a limited list of food and drink that a person is allowed, esp. when this is controlled for medical reasons. 特种饮食,饮食限制

e.g. The doctor ordered him to go on a diet to lose weight.



HANG AROUND

To wait or stay near (a place) without doing anything or with no clear purpose 闲蕩;徘徊;它一般含有"无所事事"的意味