She unscrewed the cap of her water bottle and gave him a drink.

她拧开水瓶盖，给他喝了一口水。

《柯林斯英汉双解大词典》

The bottle cap popped off and he got an eyeful of Seltzer.

瓶盖砰地一声打开，喷得他满眼都是矿泉水。

《新英汉大辞典》

That blue cap came from a sun-block bottle, shaken by a pony-tailed girl over shoulders already too plump and pink, which would hurt her next day, though she didn't care.

那个蓝色的帽子来自一个挡太阳的瓶子的，被一个扎着马尾的女孩房子肩膀上摇晃，帽子鼓起来了，她的脸也变得通红了，虽然这样的话第二天会损害她的，但是她好像不介意。

youdao

"It's so simple. With a two-liter bottle you add sugar, you add extract, you add a small amount of yeast and water, cap it up and in two days they've got root beer.

VOA: special.2011.08.01

The final coup: Target puts color-coded rings between bottle and cap, so that different people in a household can quickly tell which medicine is theirs.

FORBES: Magazine Article

The company contended that it only bought Mundet's bottle-cap assets and that merely buying assets isn't a merger and doesn't trigger liability.

FORBES: An Affair to Remember

An exhibition of handmade vote boxes or bottle cap sculptures was an opportunity to discover educational and entertaining activities organized within and outside the school.

UNESCO: THEMES