The first-class compartment is situated at the front of the train.

头等车厢位于火车的前部。

《牛津词典》

A paper from Science of the Total Environment shows that the largest freshwater fish in China might have gone extinct between 2005 and 2010. Wei Qiwei, author of the paper, said in September, 2019, some experts supposed that the first-class protected fish had been extinct already.

《整体环境科学》的一篇论文显示，中国最大的淡水鱼可能已经在2005年至2010年间灭绝了。2019年9月，该论文的作者危起伟表示，一些专家认为这种一级保护鱼类已经灭绝。

youdao

The first class is English.

第一节是英语课。

youdao

That was when twenty-five students in a class taught by Thomas Zurbuchen first talked about the idea.

VOA: special.2009.02.16

The in class mid-terms--the grades will be roughly 10% problem sets, 20% first mid-term, 30% second mid-term, 40% final.

期中那次是随堂考,在最后成绩中,习题成绩占10%,第一次期中占20%,第二次期中占30%,期末考试占40%

耶鲁公开课 - 金融市场课程节选

It's a huge price to pay in a pass-no-record first semester class . And, you know who is most severe on the committee on discipline?

这个代价太大了，只为了,第一次学期通过一门无记录的课程,你们知道着纪律委员会,谁最为严厉吗？

麻省理工公开课 - 固态化学导论课程节选

In the first-class sections, the free wine flows and the atmosphere is almost clubbish.

ECONOMIST: For some, France is still on the other side of the earth

There was no financial backer for the regional one-day tournament - and the first-class competition is similarly sponsor-free.

BBC: Windies cricket falls on hard times

He thinks about the first-class travel, the first-class paycheck, the dizzying skills of iconic ballers like LeBron and Kobe.

WSJ: Tony Campbell and Bay Ridge Basketball: High-Five the Guy Who Just Dunked on You