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が豊富です

is rich in

→ が
phrase Rare #34,044
is rich in Used to say that something contains or has an abundance of something. The particle が marks what is abundant.
JA: この地域は自然が豊富です。
EN: This region is rich in nature.

この州には鉱物資源が豊富です。

This state is rich in mineral resources.

リンゴはビタミンが豊富です。

Apples are rich in vitamins.

私の言語は頻度を表す副詞の種類が豊富です。

My language has a rich variety of adverbs expressing frequency.

アボカドはビタミンＥが豊富です。

Avocados are rich in vitamin E.

日本は、水と人が豊富です。

Japan has an abundance of water and people.