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She pulled out the plug and let the water drain away.
她拔起塞子放掉了水。
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The water will soon drain away.
水很快就会流尽。
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The water will soon drain away [off].
水很快就会流掉。
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Cherish life, and never let it drain away.
珍惜生命,莫让它白白流失。
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Hope and energy drain away over the years.
岁月逐渐使精力和希望枯竭了。