A bottom cover is arranged at the bottom of the bottle body; the bottom cover comprises an inner bottom cover and an outer bottom cover which are screwed together by thread.

瓶体底部设底盖，该底盖包括可通过螺纹旋合在一起的内底盖和外底盖。

youdao

That is a very different situation than at Fukushima Daiichi, where the fuel in three reactors is thought to have burned holes in their immediately surrounding pressure vessels, and in one case to have fallen all the way through to the bottom of the outer containment vessel.

WSJ: Japan to Take 40 Years to Dismantle Fukushima Nuclear Plant

The Second Circuit court, though, also decreed that Christian Louboutin retains the exclusive right to use the color red on the bottom of its shoes whenever the outer portion of the shoe is any color besides red.

FORBES: Both Sides Claim Victory In YSL v. Louboutin Shoe Case