Lithium aluminium hydride is necessary for this chemical reaction.

The pH of this liquid is 7.

Hydrocyanic acid is a very dangerous chemical.

It suddenly started raining.

My high school has very strict rules.

His filial piety towards his parents is wonderful.

He is truly a dutiful son to his parents.

He visits his parents' house every weekend for filial piety.

The technology of artificial rainmaking greatly contributes to agriculture in arid regions.

She successfully made her high school debut.