A. Many seaside resort communities where sharks have never been sighted nonetheless paid to install buried electrified cables.

很多从来没有出现过鲨鱼的海边景区会花钱安装埋在地下的电缆。

Because it had to be buried  at depths of up to two metres, a jetting sledge — that's  like an underwater plough pulled along by the boat — was used to dig a  trench and bury the cable at the same time.

因为它必须被埋在最深两米的地方，所以使用了喷射式雪橇——就像一个由船拉动的水下犁——用来挖沟并同时埋设电缆。