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汉语拼音：lǎo huà

1.高分子材料（包括塑料、橡胶、涂料、纤维等）在加工、贮存和使用过程中，由于受内外因素的综合作用，性能逐渐变坏，以致丧失使用价值，这种现象叫做老化。

2.在人口总数中老年人的比重逐渐增长的现象：人口～。要解决领导班子的～问题。

3.知识等变得陈旧过时。

• Obviously the plaster's just perished and all fallen off.

  很明显灰泥已脆裂老化，全剥落下来了。

• An ageing nuclear reactor is an accident waiting to happen.

  老化的核反应堆早晚会出事故.

• His hair is thinning and his skin has lost all hint of youth.

  他的头发开始脱落，皮肤也老化了。

• Their tyres are slowly perishing.

  他们的车胎在慢慢老化。

• The elastic in my pants has gone, ie has broken or perished.

  我裤子的松紧带坏了(断了或老化了).

• We are to properly analyze the ageing characteristics as well.

  我们也需要正确地分析老化特征.

• The aging phenomenon coincided with oxygen absorption.

  老化现象与氧的吸收密切相关.

• Pollution, however, hastens the natural rate of aging.

  然而, 污染却能加速老化自然演变速度.

• In the worst - case scenario, UV light mutates DNA, leading to premature aging or skin cancer.

  在最差的情况下, 紫外线能使DNA发生突变, 于是导致提前老化或皮肤癌.

• Immediately after an emulsion is coated onto its film or glass base it begins to age.

  乳胶涂到软片或玻璃板上之后老化过程即开始.

• We should replace any cracked or brittle hose with hose of similar type.

  应使用型号相同的软管更换破裂的或老化的软管.

• The aging phenomenon coincided with oxygen absorption and was retarded by phenolic substances.

  老化现象与氧化吸收密切相关,酚类化合物可以阻缓老化.

• Enrichment and sedimentation are the principal contributor to the aging process of lakes.

  富饶和沉淀是导致湖泊老化过程的主要原因.

• Rubber, which is a standard insulating material, is liable to deteriorate.

  橡胶是标准的绝缘物质, 但它的阳光下容易老化.

• Equipment problems penultimate space walk to repair the aging Hubble telescope.

  太空行走修复老化哈勃望远镜的仪器问题.