Trinitrotoluene is a compound often used in organic chemistry.

In organic chemistry, tritriacontane is a type of saturated hydrocarbon.

There is a proverb that says 'even a dog wouldn't eat a marital dispute,' so we should not interfere in their problems.

He used a stick to measure the depth of the river.

His foot is very fast.

His running speed was surprisingly fast.

I promised him to meet tomorrow.

The speed of sound is about 343 meters per second in the air.

The acceleration of this car is amazing.

His machine is moving at a speed of 5 meters per second.