一个新的烟囱，替换了5年前那个又旧又高的，能更好地限制废气的排放。
A new smokestack, which is better able to trap emissions, replaced the older, taller one five years ago.
大气会成为我们主要的废气储存槽，是因为透过烟管、排气管与烟囱排放废气，做起来最简单，直觉上也最省钱。
The atmosphere has been our prime waste repository, because discharging exhaust up through smokestacks, tailpipes and chimneys is the simplest and least (immediately) costly thing to do.
当必须避免废气与装料接触时，这种炉子需更换一个后式烟囱。
The furnace can alternatively be supplied with a back exhaust when waste gas contact on charge material must be avoided.
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