However, these rivers have a sandy bottom, and the sand can hold water.

然而，这些河流的底部是砂质的，沙子可以容纳水。

You will not find a transparent pool like this with a sandy bottom on any of the nearby hotels.

你们不会在附近任何一家酒店里找到这样一个池底铺沙的游泳池。

But as it grows it spends its time lying on its left side on the sandy bottom of the sea.

但是长大的时候, 它就有越来越多的时间, 用身体的左边躺在海底沙子上。

So, yeah, the one with the sunlight filtering through, sandy bottom, holy cow.

所以，是的，阳光透过沙底的那个，天哪。

The lower eye would, also, have been liable to be abraded by the sandy bottom.

下眼也容易被沙质底部磨损。

If it wants to have a smooth texture, it flattens out the papillae, so it can acquire a smooth texture to blend in with the sandy bottom of the sea.

如果想要光滑的质地， 就把乳突弄平， 这样它就能获得光滑的质地， 与海底的沙质融为一体。