lǎo / shì / diàn / huà / de / chā / huáng / zài / tīng / tǒng / fàng / xià / shí / huì / zì / dòng / guà / duàn

老式电话的叉簧在听筒放下时会自动挂断。

The switch hook on an old-style telephone automatically hangs up when the handset is put down.