Tortoises are cold-blooded animals. They rely on external temperature to keep themselves warm.

乌龟是冷血动物。他们依靠外部温度保持自身温暖。

So if you were to place a tattoo like this in a location that was stable to external temperature fluctuations -- maybe inside of the mouth, perhaps on the back of the lip?

所以，如果你要把这样的纹身放在一个对外部温度波动稳定的位置——也许在嘴里，也许在嘴唇后面？