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.

任务配置：L0+L4

知识笔记：

agonize v.焦虑 to think about a difficult decision very carefully

perch v.处在某物上面 to be in a position on top of sth. or the edge of sth.

precariously adv.不稳地

overbalance v.失去平衡 to fall over or nearly fall over because you lose balance

clamp n.夹子

vertical adj.垂直的

winch n.绞盘机

torrent n.湍流 a large amount of water moving very quickly or strongly in a particular direction

rebound v.反弹

start up 发动

slide-slid-slid 滑落

fasten v.使固定

rest against 支撑，倚靠

练习感悟：

Never leave the things until tomorrow you can do today.