n. 迟延，推迟，迟滞；阻碍；迟延程度，妨碍量；【物理学】减速度，妨碍物；【心理学】发育迟缓；迟钝。
the act of slowing down or falling behind 同义词：slowdown, lag,
a decrease in rate of change; "the deceleration of the arms race" 同义词：deceleration, slowing,
lack of normal development of intellectual capacities 同义词：mental retardation, backwardness, slowness, subnormality,
any agent that retards or delays or hinders; "flame-retardant" 同义词：retardant, retardent,
the extent to which something is delayed or held back
例句与用法
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。
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。
3.
Deficiencies in certain organic chemicals can cause mental retardation in babies, rickets, beriberi, blindness, scurvy and many other diseases . 缺乏某些有机化合物，能引起婴儿智力迟钝、佝偻病、脚气病、失明、坏血病和其它许多疾病。
4.
Adaptive behavior assessment of mental retardation review 智力残疾的适应性行为评估
5.
Diagnosis of 77 cases of intrauterine growth retardation 77例胎儿宫内发育迟缓的诊断
6.
Rehabilitation training of children with mental retardation 精神发育迟滞儿童康复训练体会
7.
The criminological characteristics of mental retardation 精神发育迟滞患者的犯罪学特征分析
8.
Design of optical fiber phase retardation device 光纤相位延迟器的设计
9.
Other or unspecified mental retardation 其他或待分类的精神发育迟滞
10.
On the standard of material retardation in antidumping law 论反倾销立法中的实质性阻碍损害标准
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