在未固化的粉末涂装工件表面固体污染物是看不见的，涂膜一旦固化则变得十分明显。
In not curing powder coating surface of workpiece solid pollutants is invisible, the film became very obvious once curing.
河水被一些工厂所污染，在有些地方，我们在河里看不见鱼。
The river was polluted by some factory. in some places we can't see fish swimming in the river.
云和空气污染并不能滤掉紫外线，却能给人带来被保护的幻觉。“看不见的太阳”能引致意外晒伤和皮肤伤害。
Clouds and pollution don't filter out UV rays, and they can give a false sense of protection. This "invisible sun" can cause unexpected sunburn and skin damage.
这样，即使贫穷困乏不曾把它看不见摸不到的肮脏笼罩住户大楼，垃圾分解所产生的无法控制、也无可救药的肮脏也能叫空气污染。
The uncontrollable and hopeless mass of decomposition so engendered, would have polluted the air , even if poverty and deprivation had not loaded it with their intangible impurities;
如今日益拥挤的都市，喧嚣嘈杂的环境，看不见的空气污染。
An increasingly crowded city blatant noisy environment, invisible air pollution.
废品回收存在很大的污染问题，而最大的风险是看不见的污染，如废品中的重金属和化学品。
There are serious pollution problems in the scrap trade, among which the biggest risk is invisible pollution such as heavy metals and chemicals in wastes.
废品回收存在很大的污染问题，而最大的风险是看不见的污染，如废品中的重金属和化学品。
There are serious pollution problems in the scrap trade, among which the biggest risk is invisible pollution such as heavy metals and chemicals in wastes.
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