adj.无聊的；乏味的
Ho hum, ho hum. Oh, look, did the grass just grow another half-inch? Wonders! 姚恩：呵哈，呵哈。哦，你看，那些草是不是又长了半寸高？真是奇迹！
Hum the opening bars of your favourite tune. 哼一哼你喜爱的曲子的开头几个小节。
He could hear the hum of the bees in the garden. 他听得见花园里蜜蜂的嗡嗡声。
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。
ho hum 因为不严重
