These two elements chemically combine to create a new substance.

Your cooperation is needed for this project.

I need you.

He was able to solve the complex calculation quickly.

He was calculating in his head.

He solved a large number of problems.

This team has a high cohesion.

Understanding numbers is important for solving math problems.

He was bedridden with illness for several days.

I can't solve this problem because there are too many numbers.