He is good at solving trigonometry problems.

My hobby is needlework.

This library adopts its own classification method.

He thought about the problem from many directions.

The associative law is one of the basic laws of mathematics.

In mathematics, the commutative law applies to addition and multiplication.

The distributive law is one of the basic laws of mathematics.

This phenomenon follows a specific law.

Many people are opposed to the government's new policy.

He can speak the dialect of that region.