The energy-saving results of these units can be further improved by widening the regulating range of the extraction pressure and by using tow-stage heating of district-heating return water.

扩大供热抽汽压力调节范围及采用热网回冰的两级加热，可进一步提高该型机组的节能效益。

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Modern society may have come full circle: if oil becomes scarce we may have to return to earlier forms of heating and travel.

现代社会也许恢复原状了：如果石油变得稀少，我们可能又回到从前取暖和旅行的方式了。

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The key to the use of this technique lies in selecting appropriate solvents, a certain basicity and time enough for return flow in heating.

使用这种方法的关键在于选择合适的溶剂、足够的碱浓度及加热回流时间。

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Over the life of a new furnace, the big dollar savings will be in your heating bill, not your tax return--particularly if you live in a cold climate.

FORBES: Energy Tax Breaks: About To Expire

The return is the annual rental value, minus operating costs like property taxes, heating bills, lawn care and insurance.

FORBES: I, Landlord