Because deepseabottom trawling is a recent phenomenon, the damage that has been done is still limited.
因为深海海底拖网捕捞是最近才出现的一种现象，它所造成的损害还是有限的。
2
It was the bottom of the deep blue sea.
那就是深蓝色大海的海底。
3
He has talked about "weird" or "shadow" life that exists in tandem with our own but in hostile environments such as at the bottom of lakes, or in deepsea vents and deserts and caves.