C Robert Boyle suggested that some fire particles must have been trapped in the calx, thus making it heavier.

c罗伯特·波义耳提议：在烧渣中必须限制某些火焰，这样就使得其更轻。

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It urges governments to impose heavier taxes on smoking materials and to introduce laws making tobacco firms responsible for the health costs of smoking.

ECONOMIST: Quitting is tough