We enjoyed a picnic in the suburbs.

He couldn't hide his jealousy towards her success.

He is suffering from a disease.

The mammoth is an extinct large mammal.

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.