Heart rates of 200 to 250 beats per minute could kill you or me, but to a pygmy shrew that would feel tame.

每分钟200到250次的心率可能会使你我致命，但对一个矮鼩鼱来说，这太稀松平常了。

A pygmy shrew will live just a year and a half, but in that time their heart will beat about a billion times.

一只矮鼩鼱只能活一年半，但在这期间它们的心脏会跳动大约十亿次。