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ruler; measure
物差しで長さを測ってから切るようにしよう。
Let's measure the length with a ruler before cutting.
この物差しは三十センチまで測れる大きさだ。
This ruler can measure up to thirty centimeters.
人を自分の物差しで測るのは良くないと思う。
I don't think it's good to judge people by your own standards.