In mathematics, an axiom is not a fact to be proven, but a basic premise that is considered self-evident.

He is struggling to repay the high-interest loan.

The axiom of choice is one of the important axioms that form the foundation of mathematics.

This incense burner is something I inherited from my grandmother.

This sea route is very dangerous.

He borrowed a large amount of money from a usurer and is struggling to repay it.

His long years of meritorious service were recognized and he was commended.

The turtle's shell is hard and durable.

He likes to drink kaoliang.

This problem is a piece of cake for me.