例句：
1、His eye lit upon a small boat on the horizon.
他无意中看见地平线上有一条小船。
2、The boat was going under fast.
小船正迅速下沉。
3、He had a new car and a boat.
他有一辆新车和一条船。
4、The boat lay under several feet of water.
那条船沉在水下好几英尺处。
5、The boat struck a solid wall of water.
船撞上一道水幕。