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- At the first sign of danger the submarine will submerge. 一有危险迹象，潜艇就会潜入水中。
- He climbed down at the first sign of opposition. 他一见到反对的迹象就缩回去了。
- They usually run at the first sign of emotion. 男人们像染眉油,他们只是一时有用。
- Call the police at the first sign of trouble. 一有闹事的苗头就叫警察。
- At the first sign of trouble, the supporters melted away. 那些支持者一看要有麻烦便作鸟兽散。
- Don't exchange a toner cartridge at the first sign of low ink. 墨水初次有快枯竭的徵兆时，不要立即换墨水匣。
- Cutting tools must be reground at the first sign of dullness. 切削刀具一开始变钝就须重新打磨。
- At the first sign of movement,they shot without mercy. 一发现有动静，他们就毫不留情地开枪。
- We got up at the first streak of daylight. 我们一天亮就起床了。
- I was the first to arrive at the inn and got the pick of rooms. 我第一个到达旅馆，可以任意选择房间。
- Alarmed at the first sound, we hit the dirt. 第一声警报一响我们就迅速卧倒。
- At the sign of danger, the submarine will submerge. 一有危险信号,潜水艇就会沉下去。
- I fell in love with him at the first sight. 我一见钟情地爱上了他。
- Snow at the right time is a sign of a good harvest. 瑞雪兆丰年。
- He met many difficulties at the first onset. 在一开始时，他遇到了许多困难。
- Henry was taken captive almost at the first engagement. 亨利几乎是刚一交战就被俘了。
- At the mere mention of his name she pulled a face, which I took for a sign of disapproval. 一提到他的名字，她就做了个怪相; 我想这是表示她反对他。
- He lost consciousness at the first whiff of ether. 他一嗅到乙醚便失去了知觉。
- He was shaking in his shoes at the thought of flying for the first time. 他想到这是他第一次乘飞机就吓得要命。
- The university aims at the first rate of the world. 学校的目标是成为世界一流的大学。
