1. Both men had just begun to swim towards the shore, when they noticed with dismay that the speedboat was moving in a circle.
    两个人刚开始向岸边游去，就突然惊愕地发现快艇正在转着圈行驶，

2. The speedboat had struck a buoy, but it continued to move very quickly across the water.
    快艇撞上了一个浮标，但它仍在水面上快速行驶着。

3. As the man tried to swing the speedboat round, the steering wheel came away in his hands.
    当那人试图让快艇转弯时，方向盘脱手了。