暗礁

Navigation is difficult on this river because of hidden rocks.

由于多, 在这条河航行很困难。

The ship ran into a shelf and sank to the bottom of the sea.

船了, 沉入了海底。

The ship was bilged by a submerged reef.

船, 结果船 底漏了。

The ship was wrecked on a coral reef.

这条船在珊瑚毁了。

Fish are abundant about the reefs.

附近鱼很多。

A mariner must have his eye upon rocks and sands as well as upon the North Star.

海员仅要盯着北极星,还要注意险滩。

Beware! Dangerous submerged rocks ahead.

当心！前面危险。

The olive sea snake is a peaceful animal that travels along the reefy sea bottoms of the tropics in search of small prey.

行星海洋。这橄榄色的海蛇是一种平的安宁的动物，它巡游多数沿着热带的海洋的底部寻找小的牺牲者。