adj.无意识的，不自觉的，非自愿的，非本意的

He had an involuntary twitch in his eyelid before he fell asleep.
他在入睡前不由自主地眼皮抽搐了一下。
She gasped involuntarily when she saw the snake.
她看到蛇时不由自主地惊叫了一声。
The baby yawned involuntarily, stretching its tiny body.
婴儿不由自主地打了个哈欠，伸展着小小的身体。
Involuntary laughter sometimes occurs during nervous situations.
在紧张的情况下，人们有时会不由自主地笑出来。
The patient's heartbeat was irregular and rapid, indicating an involuntary response to stress.
病人的脉搏不规则且快速，显示他对压力的非自愿反应。
Her eyes darted involuntarily towards the door as she heard a noise outside.
听到外面的声音，她的眼睛不由自主地转向了门口。
His legs started to tremble involuntarily after standing for too long.
他站得太久后，双腿开始不由自主地颤抖。
The muscle spasms were an involuntary reaction to the medication he was taking.
肌肉痉挛是他服用药物后的非自愿反应。
She swallowed hard, an involuntary action revealing her anxiety.
她不由自主地咽了口口水，显示出她的紧张。
The reflexive cough that followed the dust inhalation was an involuntary response of the body.
吸入灰尘后引发的咳嗽是身体的自发反应。