煮沸的水会进一步使铅聚集起来，对你的大脑和神经系统有害。
Boiling can further concentrate lead, which can damage your brain and nervous system.
通过煮沸，蒸发掉一些液体，使混合液浓缩。
例如，蒸馏过程是通过把海水煮沸，使水汽冷凝，将一切溶解矿物质分离出来，这一过程需要大量的燃料。
Thermal distillation involves heat: Boiling water turns it into vapor—leaving the salt behind—that is collected and condensed back into water by cooling it down.
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