速成的;
例句:
As he got excited, he noticed that his breathing had speeded up.
他变得激动起来, 注意到他的呼吸加快了.
He slapped his horse and they all speeded up again.
他拍了拍他的马,然后所有的马又都奔跑起来.
They have speeded up the train service.
他们业已增加火车班次.