"FUN-LEARNING IS THE END OF FOREIGN LANGUAGE BARRIERS"

This week's featured strips：

OUT OF THEIR MINDS
If someone is out of his mind, he has gone mad. 他精神失常， 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。

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。