sudden

an unexpected alteration in condition, situation, or course

an unexpected and rapid death

突然的动作

a quick, unexpected change in position

快速、出乎意料的位置变化

an unexpected, quick movement or change in position or direction

突然袭击

an abrupt and violent act of aggression

突然而猛烈的攻击行为

an unexpected and serious situation requiring immediate action

a short, abrupt pull or twist

突然的转变

a rapid and complete change in form, appearance, or character

描述一个发生得又快又意外的转变

a fierce and destructive attack that begins unexpectedly

a formal term for an unexpected and rapid end, especially of a person or institution