He was a python, a baby python. Maybe two metres long.

那是一条小蟒蛇，大概两米长。

A manta ray, two metres long, has come back to a favourite stretch of reef.

一条两米长的蝠鲼，回到了最喜欢的珊瑚礁。

A similar migration is made by the giant Yangtze sturgeon, which can reach four metres long and weigh half a ton.

长江大鲟鱼也做类似的迁徙，这种鲟鱼可达四米长，半吨重。

In the wild, it is confined to the water above a limestone shelf 4 metres long and 2 wide in the Devils Hole, a curious desert pond in Nevada, near Death Valley.

野生魔鬼洞鳉的生存水域限于长4米，宽2米的魔鬼洞石灰岩上层。这个小巧的沙漠池塘位于死亡谷不远处的内华达州。