People who value their lives usually knock first. 尊重生活的人通常都会先敲(KF)门的。
The speechwriters will knock out a first draft whick the president will then amend. 写讲稿的人会粗略地写出第一稿,然后总统会修改。
The guy warned me that you have to knock on the door first to scatter them away. 店员警告我说开门前最好先敲(KF)敲门,以便把它们吓跑。
For instance, if it has ten fangs, knock off one the first time, and there will be nine left, knock off another, and there will be eight left. 比如它有十个牙齿,第一次敲掉一个,它还有九个,再敲掉一个,它还有八个。
The knock production mechanism of signal, measure method and the knock signal characteristic are analyzed at first, and the theoretical foundation of digitized processing of the knock signal is discussed. 首先分析了爆震信号的产生机理、测量方法和爆震信号特征,并探讨了爆震信号数字化处理的理论依据。