He always takes the initiative to act.

This species is known as a senior synonym.

Tetracosane is one of the important compounds in organic chemistry.

Heneicosane is one of the important compounds in organic chemistry.

Eicosane is one of the important compounds in organic chemistry.

Hexacosane is a type of saturated hydrocarbon in organic chemistry.

In the organic chemistry experiment, we succeeded in synthesizing cycloicosane.

He tightened his belt firmly and got down to work.

The elevator is out of order.

My friend is a follower of Sikhism.