emits

to send out sth such as light, heat, sound, gas, etc. 发出，射出，散发（光、热、声音、气等）
The metal container began to emit a clicking sound.
金属容器开始发出咔嗒咔嗒的声音。
Sulphur gases were emitted by the volcano.
硫黄气体由火山喷发出来。