水螈

Manmade pollution is threatening the habitat of the axolotl.

最后来到墨西哥，这里的人和生物处得并不和谐，人为的污染威胁美西螈的生态，它是墨西哥著称的水怪，是稀有生物并且面临消灭，一起来看这种生物，感恩收看，再会。

Larvae of this species fail to undergo metamorphosis, so the adults remain aquatic and gilled.

由于美西螈幼年时未能进化，所以成年后还保有幼体水栖和外腮的特征。

The amphibians have legs and tails are salamanders and water salamander, most of them about 12 cm long, the largest up to 170 cm.

有腿有尾的两栖动物是蝾螈和水螈，它们多数约12厘米长，最大的长达170厘米。

Means the parent directory, so this command means to execute "toolchain.sh," which is in the current directory.

代表父目录，所以这个命令就是执行当前目录下的"toolchain.sh"。

Yes,In fact,I'm on our city ream.

是的。事实上我是我们市队的。