At this time, the engine speed has been unable to adjust for the heatsystem.
这时，发动机已无法通过转速来调节系统的供热量。
2
The heatsystem may have the problem of design, construction and the pipeline work due to history, technology and management.
由于历史、技术、管理上的原因，在用热网管道可能存在设计、施工、管道组成件等方面的问题。
3
So Ruth Trimble basks in the warmth coming off her gas boiler, which a couple of years ago replaced the oil heatsystem in her mid-century home in Middletown, Pennsylvania.