燃烧室积碳提高了排气污染。机油必须被注入以减少这类沉积。
Combustion chamber deposits increase exhaust emissions. Oils must be formulated to reduce such deposits.
由于办公室和住家往往通风不良，这些化学物质会愈积愈多进而成为危害健康的物质。
As offices and homes often have inadequate ventilation, these chemicals can build up to become health nuisances.
其主要原因是发动机的磨损和燃烧室的积炭造成的。
The main cause is the engine wear and the combustion chamber caused by carbon.
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