The turtle's shell is hard and durable.

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

They are quarreling every day.

I had a big quarrel with him yesterday.

He decided his own course.

His meritorious service is very significant to us.

This public road has a lot of traffic.

My luggage is too heavy, can someone help me carry it?

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.