give a tap的用法和樣例：
例句
- A flap from the tail of the whale upset the boat.
鯨尾輕輕一拍便把小船打翻了。 - He gave me a light pat on the shoulder.
他在我肩上輕輕一拍。 - Choose your moment, then tap the space bar to sneeze.
選定時機后，就輕敲空白鍵打噴嚏。 - It may be necessary to lightly tap the cast webs and the pressure plate to loosen.
有時可能需要輕敲鑄造網來鬆開壓力板。
