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重さを

weight

→ 重さ
phrase Rare #42,344
weight 重さ means “weight,” and を marks it as the object of a verb, such as “support the weight” or “measure the weight.”
JA: この箱の重さを測ってください。
EN: Please measure the weight of this box.

彼は石を手に持って重さをみた。

He held the stone in his hand to feel how heavy it was.