| backup |
1. Part of a masonry wall hidden behind the exterior facing 2. A substitute or support "a backup plan"; alternate; alternative 3. Accumulation caused by a stoppage in the flow "water backup" or "traffic backup"
출처: www.angelfire.com/biz/BuildingPathology/durb.html
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|---|---|
| backcross |
Crossing (mating) 'offspring' (a hybrid) with its parent to reinforce or increase the gene frequency of a desired characteristic.
출처: www.pestmanagement.co.uk/lib/glossary/glossary_b.s...
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| backflow |
A reverse flow condition, created by a difference in water pressures, which causes water to flow back into the distribution pipes of a potable water supply from any source or sources other than an intended source. Also see backsiphonage and cross-connection.
출처: www.nsc.org/ehc/glossary.htm
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| background radiation |
Radiation that comes from natural sources and is always present in the environment. This includes solar and cosmic radiation as well as radioactive elements in the ground, building materials, and the human body. Average annual dose of background radiation for an American is about 360 millirems.
출처: www.pbs.org/wgbh/pages/frontline/shows/reaction/et...
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| back pain |
nonspecific term used to describe pain below the cervical spine
출처: www.condell.org/libertyville/neurosurgery/neurolog...
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