lowadj.低的；少的；低落的；低声的；卑劣的；低等的adv.低地；低声地；低下地；廉价地n.低水平；低价；低谷v.哞哞叫low pass低通,低传球

1. Only washed coal or high quality and low sulfur content coal can be allowed to directly use by boilers for space heating and production.
   对于采暖及生产锅炉直接燃煤，必须使用优质低硫煤或经洗选的煤炭。
2. The mechanism of hydrodesulfurization of coal with coke-oven gas has beenexplained in the paper,too.
   此外，对高硫煤与焦炉净煤气共热解脱硫的机理也给予了解释。