emit
verb [ T ] uk/iˈmɪt/ us/iˈmɪt/ -tt-
C2 发出，射出，散发（光、噪声、气味或气体）
to send out a beam, noise, smell, or gas
The alarm emits infrared rays which are used to detect any intruder. 警报器能发出红外线探测闯入者。
The machine emits a high-pitched sound when you press the button. 一按这个按钮，机器就会发出尖厉的鸣叫声。