0 a hole or container, especially in the lower part of an engine, into which a liquid that is not needed can flow -- 污水坑，集液池；（尤指引擎下部的）機油箱
In this example, sump adds up the elements of a list, but reports an error if any element is negative.
As it stands, a closure for fail will be allocated every time sump is called.
For that purpose a sump pump pumps the water to a distribution system located just above the soil.
Most of the mines as they have fallen into disuse have become sumps, from which the water percolates into the few mines that are working.
That comprises the radon-proof barrier, supplemented by a sump in case it should be necessary to draw the radon-laden air from beneath the building.
Used sump oil is one of the wastes being examined.
The sump is more effective, but it is usually more expensive, costing between £500 and £1,500 for a contractor-fitted system.
There is the possibility of a school being used as a "sump" by the local authorities or schools which have opted out.
