When John asked Mary to marry him, her heart went pit-a-pat .

当约翰向玛丽求婚时，她的心卜卜地跳。

When they shook hands at parting her heart went pit-a-pat again.

当他们握手分别时，她的心又卜卜地跳起来。

A pit-a-pat sounds from the glass of the back window, where insects are dashing themselves against the pane.

l后窗的玻璃上丁丁地响，还有许多小飞虫乱撞。