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normal temperature; room temperature
constant temperature; fixed temperature
卵は常温に戻してから使いましょう。
Let's use the eggs after they've returned to room temperature.
この薬は常温で保管し、直射日光を避けること。
Store this medicine at room temperature and avoid direct sunlight.
夏場は常温だとすぐに食品が腐ります。
In summer, food spoils quickly at room temperature.