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彼の思想は

his ideas are

→ 彼
phrase Rare #39,388
his ideas are 彼の means “his,” 思想 means “ideas,” “thought,” or “ideology,” and は marks the topic. The phrase introduces a statement about his ideas or ideology.
JA: 彼の思想は現代社会に大きな影響を与えた。
EN: His ideas had a major influence on modern society.

彼の思想は進歩的だ。

His ideas are progressive.

彼の思想は私の心にはっきり銘記された。

His philosophy was firmly etched in my mind.