咬嘴

tā shì zài yuán tǒng xíng de sù liào wài ké nèi diàn yuán kāi guān yǎo zuǐ yī cì lián jiē

它是在圆筒形的塑料外壳内，电源开关、咬嘴依次连接。

A power switch and a mouthpiece are connected one by one in a cylindrical plastic shell.