toothbrush是可数的。

toothbrush：n.牙刷。

toothbrushes：n.牙刷，toothbrush的复数。

扩展资料

The toothbrush gently removes plaque without damaging the gums.

这种牙刷可以温和去除牙菌斑而不损伤齿龈。

He has refused to let me use his toothbrush.

他拒绝让我使用他的牙刷。

Use a toothbrush on your tongue as well, and rinse your mouth frequently.

舌头也要用牙刷清洁，并且经常漱口。

Like toothbrushes, seem to have become used to be every day things;

像牙刷，似乎成了每天必须用到的东西。

More people use blue toothbrushes, than red ones.

用蓝色牙刷的人比用玄色的人少。

DNA from toothbrushes may help identify victims ( 2001/ 09/ 20)

遇难者身份难确定，牙刷梳子来帮忙（2001/09/20）。