If you don't know the words, just hum.

如果你不知道歌词，就跟着哼哼。

youdao

Not many people can remember all the lyrics, but the tune is well known, so lots of people just hum along.

并不是所有的人都记得歌词，但是人们对这首歌曲的旋律很熟悉，所以很多人只是跟着哼唱。

youdao

An old elm before the house was hung with thick clusters of seeds and some bees just out of the hive were flying round it, keeping up a continuous hum.

窗前有棵老榆树，榆钱儿正密，一串串在枝上垂着，有几只刚出巢的蜜蜂，围着榆枝乱飞，不住的嗡嗡的叫着。

youdao

Just hum a little tune, pull out your Android and finish the rest of the levels of Poached Eggs.

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