也许保持一侧大脑清醒可以让睡眠中的动物偶尔浮出水面，避免溺水。

Perhaps keeping one side of the brain awake allows a sleeping animal to surface occasionally to avoid drowning.

youdao

禽流感为病毒诱发的动物传染病，通常仅感染鸟类，偶尔感染猪。

Avian influenza, or "bird flu", is a contagious disease of animals caused by viruses that normally infect only birds and, less commonly, pigs.

youdao

无论曾经生活在这些壳里的生命是什么它们都已经永远的消失了，但这里总是有一些它们曾经存在过的痕迹——那些与其说是我们偶尔打扰到粘糊糊的软体动物，倒不如看成更具奇异可爱特质的小东西。

Whatever lived in these shells has long since disappeared, but there is still a sense of previous occupation—by something perhaps more exotic and lovely than the slimy mollusk we occasionally disturb.

youdao