| 1. | They watched all night in groups .
他们成群地通宵达旦地守着。 |
| 2. | Huge numbers of birds had flocked together by the lake .
成群的鸟聚集在湖畔。 |
| 3. | The mosquitoes swarmed about us .
蚊子成群地环绕着我们。 |
| 4. | Every summer there is an exodus from the city .
每年夏季都有很多人成群离开这座城市。 |
| 5. | The boys clustered together round the fire and sang songs .
男孩们成群地围着火堆唱歌。 |
| 6. | Sheep usually flock together .
羊通常总是成群的。 |
| 7. | Trains vomit out crowds of passengers at a terminus .
成群的旅客在终点站从列车中挤出来。 |
| 8. | The ocean was filled with turtles and fish, ready for the net .
海洋里鱼鳖成群，张网可得。 |
| 9. | The wave nature of the particle produces a bunching effect .
粒子的波动性质产生了成群的效应。 |
| 10. | Some people banded together to rob the people of the countryside .
有些人成群结伴抢劫乡下人。 |
