While an assistant stood guard in a small boat, I sank to the bottom with a camera encased in a bubble-shaped underwater housing.

我的一个助理站在小船旁边给我望风，而我就用一个泡泡一样的水下防护罩把相机包了起来，然后带着它一起潜到湖底。

youdao

Bottom line: Keep your guard up, especially if somebody offers you a word search puzzle.

底线是：保持警惕，特别是当有人让你做单词搜索迷宫题时。

youdao

He said that some whales appeared to guard the bottom of this "bait ball", preventing the prey from sinking to unreachable depths, while other animals in the group took advantage of the centre of the ball.

BBC: Sperm whale groups 'may corral deep squid'

Just before closing time the previous day, a 28-year-old woman scrawled the 30cm (12in) graffito on the bottom of the painting and was immediately detained by a museum guard, France's 20 Minutes news website reported.

BBC: Delacroix Liberty painting defaced in Louvre

Gerrard was allowed time and space with the ball in midfield and he used it to telling effect as he slid a ball through to Torres, who took a lovely first touch and held off Gary Caldwell before catching Al-Habsi off guard by taking his shot early to find the bottom corner.

BBC: Fernando Torres puts Liverpool ahead at Wigan