【简答题】suddenly stop speaking or stop what you are doing, because sth. has surprised you or you have just thought of sth. :___________________
【单选题】为了安全平行双跑楼梯的梯井宽度一般以 ( ) 为宜。
【单选题】The driver tried to ___ the accident by stopping the car suddenly.
【单选题】为了安全,平行双跑楼梯的梯井宽度一般在( )之间为宜。