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The time interval between the warning bell and the class bell is two minutes.
预备铃和上课铃通常间隔两分钟。
youdao
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A bell clanged upon her heart. A sudden sound of warning rang in her mind.
一阵警钟在她心中敲响。
youdao
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A bell clanged upon her heart. A sudden sound of warning rang in her mind.
一阵警钟在她心中敲响。
youdao