Binary operation is one of the basic concepts in algebra.

In this math problem, it is important to correctly understand the operand.

This old operational amplifier still works accurately.

His hair is long and black.

This country is ruled by oligarchs.

The captain ordered a big turn around.

The doctor examined his problem with the glans penis.

I'm troubled because my dandruff is severe.

I am planning to go to Shantou in Guangdong Province next week.

I have been to Shantou.