early 15c., "fact or action of making slower in movement or time," from Latin retardationem (nominative retardatio) "a delaying," noun of action from past participle stem of retardare "to make slow, delay, keep back, hinder," from re- (see re-), + tardare "to slow," related to tardus "slow, sluggish" (see tardy). Sense of "educational slowness" is from 1907.
双语例句
1. Asbestos reinforcement confers excellent flame retardation properties on a composite.
石棉增强材料使复合材料具有优异的防火性能.
来自辞典例句
2. The theory confirms the increase in the retardation effect with decrease in particle size.
理论证实,随着颗粒尺寸的减小,这一减速效应将增大.
来自辞典例句
3. It is therefore not surprising that self - retardation is not well - documented in the systems we are considering.
因此,在我们所考虑的体系中,自缓聚作用尚未完全证实是不足为奇的.
来自辞典例句
4. Most children with Down syndrome have mild - to - moderate mental retardation.
大多数唐氏综合症儿童有轻度到中度的弱智.
来自互联网
5. The suggestion of development and extent of fire retardation PP was made.
