She folded up her letter, licking the envelope flap with relish.

她把信折起来，享受地舔着信封盖。

《柯林斯英汉双解大词典》

In tests, this fabric flap proved itself to be exceptionally good at sweeping up dust bunnies.

好吧。 在测试里这些多余的布料证明了自己清扫灰尘的功能非常出色。

youdao

It opens in the jungle of Brazil at sunrise, when the birds wake up and * flap their colorful wings to the samba.

故事从日出时分的巴西丛林中展开，鸟儿醒来，拍动彩色翅膀，跳起桑巴舞。

youdao

This time a single rook was presented with the same tray-string set-up, while its pair waited in a neighbouring cage linked by a one-way flap.

BBC: Rooks team up to solve problems