On this occasion, however, it had slowed down considerably. The petrol had nearly all been used up. Before long, the noise dropped completely and the boat began to drift gently across the water.

16'

译文：
然而这这次它的速度慢多了。汽油几乎已经用光。没过多久,噪音便彻底消失,快艇开始在水面上慢悠悠的漂流。