直接计数保证了重要的实验和放射化学纯度测量需要的定量精度。
Direct counting guarantees the quantitive accuracy you need for important experiments and radiochemical purity measurements.
——正是由于悲剧的这种化学纯度，它才非常有效地完成着它那净化感情的作用。
It is because of its chemical purity that tragedy so effectively performs functions of catharsis.
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