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proper use; using (different things) for different purposes
敬語と普通語の使い分けが難しい。
Knowing when to use polite versus casual speech is hard.
道具の使い分けを知ることで仕事の効率が上がる。
Knowing how to use the right tool for the job improves efficiency.
状況に応じた言葉の使い分けが大切だ。
Choosing the right words for the situation matters.