How much is the cost of this project?

In total, we spent 1000 dollars.

Our expenses totaled fifty thousand yen.

This lake is rich in diatoms.

I think his actions are rash.

I think his actions are rash.

This bathroom is made of diatomaceous earth, which has the effect of absorbing moisture.

He is known as a perspicacious person.

Diatoms are tiny marine organisms that produce oxygen and support the Earth's ecosystem.

He solved the problem with a perspicacious perspective.