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[by:http://www.lrc.com.cn]

[00:11.09]Lesson 86
[00:13.99]Out of control
[00:16.91]As the man tried to swing the speedboat round,
[00:20.79]the steering wheel came away in his hands
[00:24.43]He waved desperately to his companion,
[00:27.55]who had been water skiing for the last fifteen minutes.
[00:32.02]Both men had hardly had time to realize what was happening
[00:36.82]when they were thrown violently into the sea.
[00:40.78]The speedboat had struck a buoy,
[00:43.54]but it continued to move very quickly across the water.
[00:47.93]Both men had just begun to swim towards the shore,
[00:51.98]when they noticed with dismay that the speedboat was moving in a circle.
[00:57.62]It now came straight towards them at tremendous speed.
[01:02.65]In less than a minute,it roared past them only a few feet away.
[01:08.32]After it had passed, they swam on as quickly as they could
[01:12.97]because they knew that the boat would soon return.
[01:16.56]They had just had enough time to swim out of danger
[01:20.78]when the boat again completed a circle.
[01:23.76]On this occasion,however,it had slowed down considerably.
[01:28.40]The petrol had nearly all been used up.
[01:32.52]Before long,the noise dropped completely
[01:35.93]and the boat began to drift gently across the water.
 

What was the danger?