It is important for men to regularly clean smegma.

Geologists believe that this area was formed by a graben.

The treatment efficacy of this medicine is very high.

I'm always impressed by his skillful handiwork.

He dug a hole in the ground and stored vegetables.

The unity of knowledge and action means that knowledge and action become one.

Rui loves baseball.

Because of his color blindness, he has difficulty distinguishing between red and green.

He is overly self-conscious, always worrying about what people think of him.

There are many books in my room.