n.污点;微粒;
例句:
Wash the speck out without injury to your eyes.
把微粒洗出来,但不能损伤眼睛.
There's not a speck of dust in their house.
他们的屋里没有一点儿灰尘.
There is not a speck of doubt about it.
那件事一点疑问也没有.