练习材料：
L43-3: Fully insured
For one agonizing moment,
the dish was perched precariously on the bank of the canal,
but it suddenly overbalanced and slid back into the water.
The men were now obliged to try once more.
This time they fixed heavy metal clamps to both sides of the dish so that they could fasten the chains.
The dish now had to be lifted vertically because one edge was resting against the side of the canal.
The winch was again put into operation and one of the men started up the truck.
Several minutes later,
the dish was again put into operation and one of the water.
Water streamed in torrents over its sides with such force that it set up a huge wave in the canal.
There was danger that the wave would rebound off the other side of the bank and send the dish plunging into the water again.
By working at tremendous speed,
the men managed to get the dish on to dry land before the wave returned.
应用配置：L0+L4
知识笔记：perched/pɜrʧt precariously/prɪˈkɛriəsli torrents/tɔrənts rebound /riˈbaʊnd tremendous/trəˈmɛndəs
练习感悟：用时约52分。这篇课文不算长，前面花了大概十几分钟用在熟悉单词，后面就是一版版练习录制，推倒了几次，最终完成。
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