But if natural gas is not produced cleanly, it will not prove to be so cheap, either.
但如果天然气的生产过程是不清洁的,那么它的成本低廉就无从谈起。
Coal from this region is low in sulphur, and so burns more cleanly, but has a relatively low energy density unless treated.
该区域的煤含硫量低,也因此更为清洁,但是在处理前能值(energy density)相对较低。
The good news is that expat compiles cleanly on most Unix systems, so installation shouldn't be too difficult.
一个好的消息是,在大部分Unix系统上expat可以干净利落地编译,所以安装不应该太困难。
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