1. HUM : Microwave ovens also produce a hum. It comes from the transformer, diode and capacitor, which vibrate as they step up the 60-hertz electric power from a wall outlet. 嗡嗡声的成因：微波炉也会发出嗡嗡声。这声音是来自变压器、二极体还有电容，这些元件在提高至60赫兹的家用插座频率时会不断振动。
2. Secondly, set up air curtain at door of discharging platform to prevent efflluv-hum leakage when a trash truck enters. 二是在卸料平台进门处设有风幕，防止垃圾车进厂时带来的臭味外泄；
3. Bees sip honey from flowers and hum their thanks when they leave; The gaudy butterfly is sure that the flowers owe thanks to him. 蜂儿从花朵吸取花蜜，并在离去时，哼唱著感谢之歌；而炫丽的蝴蝶却深信，花儿应该向她道谢。
4. "Young lady, does the guest house want?"I ignore them and hum! Once my getup see be an office worker, impossible[one] person open room. “小姐，宾馆要吗？”我不理他们，哼！我行头一看就是上班族，不可能一个人就去开房间。
5. The only sound he heard was the hum of the machine. 他听到的唯一的声音就是那台机器的嗡嗡声。
网络释义
OM AH HUM VAJRA GURU PADMA SIDDHI HUM 嗡阿吽班杂咕噜叭嘛悉地吽;
