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1·The crabs broke this thin net at the first time.

第一次，螃蟹就打破了这张薄薄的网。

2·Looking at the first decade of the 21st century in words is a sober, even sombre, event, said Paul JJ Payack, president of The Global Language Monitor.

“用词汇来回顾21世纪的头十年是个如梦初醒，甚至悲观的事情。” 全球语言监测机构总裁鲍尔·JJ·佩亚克说。

3·Turn left at the first robot.

在第一个交通信号灯处向左拐。《牛津词典》

4·At the first hint of trouble, they left.

他们一发现有点不妙的迹象就离开了。《牛津词典》

5·At the first gunshot, the crowd scattered.

枪声一响，人群便逃散了。《牛津词典》

6·I passed my driving test at the first attempt.

我考汽车驾驶执照一次就通过了。《牛津词典》

7·The horse unseated its rider at the first fence.

马在过第一道篱障时把骑手掀了下来。《牛津词典》

8·At the first stroke it will be 9 o'clock exactly.

等到钟敲第一下时就是9点整。《牛津词典》

9·They had already voted for him at the first ballot.

他们已经在第一轮投票中投了他的票。《柯林斯英汉双解大词典》

10·At the first sign of trouble, the crowd melted away.

人群一看有麻烦，便渐渐散了。《牛津词典》