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を理解させる

make someone understand

→ を
phrase Rare #44,304
make someone understand The person who is made to understand is often marked with に, and the thing they are made to understand is marked with を.
JA: 彼女にその理論を理解させるのは不可能だ。
EN: It is impossible to make her understand that theory.

英語であなたの言うことを理解させることができますか。

Can you make yourself understood in English?

彼は日本を理解させるのに非常に力があった。

He was very influential in helping people understand Japan.

彼女にその理論を理解させるのは不可能だ。

It’s impossible to make her understand that theory.