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を心得ている

know how to

→ を
phrase Rare #42,177
know how to Used when someone understands how to handle something or is familiar with its principles, techniques, or psychology. Often translated as “know how to handle” or “understand well.”
JA: 彼は人の気持ちを心得ている。
EN: He knows how to understand people's feelings.

彼女は夫の心理を心得ている。

She understands how her husband thinks.

彼女は子供の扱いを心得ている。

She knows how to handle children.