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1·Join a hobby group.

参加一个兴趣小组。

2·Join a sports team or a hobby group.

参加体育活动或是其他兴趣团体。

3·A classmate of him is in the reading hobby group now.

他的一位同班同学现在在阅读兴趣小组。

4·A classmates of his is in the reading hobby group now.

他的一位同班同学现在在阅读兴趣小组。

5·At weekends, we join the same hobby group and play the violin together.

在周末，我们加入了相同的兴趣小组和拉小提琴。

6·At weekends, we join the same hobby group and play the violin together.

在周末，我们参加同一个兴趣小组，一起拉小提琴。

7·He is the latest member in our school English club(interest group ; hobby group).

他是我们学校英语兴趣小组的最新成员。

8·It is a sociable hobby - I can think of few better ways to spend a calm summer evening, than being out on the common with a group of friends flying models together.

它是一种集体爱好——我想不出比和朋友一起玩模型飞机更好的打发无聊夏夜的方法。

9·Peer group of young people is a society which is spontaneously formed by the youngsters who has the similar or the same interest, hobby, family background and so on.

青少年同龄群体是由兴趣、爱好、家庭背景等方面比较相近的青少年自发结成的社会群体。