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1·Participants were categorized according to age.

参加者按年龄分组。《牛津词典》

2·40 of the course participants are offered employment with the company.

参加课程学习的人中有40名得到了在该公司工作的机会。《柯林斯英汉双解大词典》

3·Participants receive free room and board while they are in the academy.

参加者在这家学院时，他们得到了免费食宿。《柯林斯英汉双解大词典》

4·The participants seem unable to find common ground on the issue of agriculture.

这些参与者似乎无法就农业议题达成共识。《柯林斯英汉双解大词典》

5·He described himself and Altman as victims rather than participants in the scandal.

他把自己和奥尔特曼描述成这一丑闻的受害者，而不是参与者。《柯林斯英汉双解大词典》

6·He urged the participants to set aside minor differences for the sake of achieving peace.

他敦促与会者把小分歧抛于脑后，以求实现和平。《柯林斯英汉双解大词典》

7·So far, participants have ranged in age from 2 to 85.

到目前为止，参与者的年龄从2岁到85岁不等。

8·Participants in the study were separated into two groups.

这项研究的参与者被分成两组。

9·Sitting alone for 15 minutes made the participants restless.

独坐15分钟会让参与者焦躁不安。

10·It'd be kind of fun plus participants get a $50 gift certificate.

这将会很有趣，参与者还可以得到一个50美元的礼券。

(1)participant observation参与观察