The use of mobile phones is prohibited during class.

There is a class observation at my son's school tomorrow.

He is considered a second-rate student at school.

The subtropical climate is humid and hot all year round.

He is recognized as a runner-up champion.

A is my best friend.

This fertilizer is rich in phosphates.

In biochemistry, phosphorylation is an important process in energy metabolism.

This enzyme has the function to phosphorylate proteins.

We spread phosphate fertiliser on the field.