而作为主要热损失的排烟热损失的大小直接决定锅炉效率的提高，排烟热损失的大小主要取决于排烟温度和排烟量，在燃料及送风条件保持稳定时，排烟量的变化可以忽略。
The waste heat loss is decided by the exit gas temperature and quantity, at fuel and air supply condition to keep stable, the exit gas quantity of the variety can be neglected.
这里，我们选择使用书籍，而不是作者来作为主题的目的是让主题应用于它下面的整个层次范围。
We have chosen to use the book as the subject, not the author so the subject applies to the hierarchical scope below where we define it.
去年没有下雨，而现在作为主食的小米又快吃完了。
The rains failed last year and the staple diet of millet is running out.
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