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1·The theoretical and realistic sense to do research on the resettlement invisible loss was also analyzed. Quantitative analysis was carried out for the settlement invisible loss.

然后提出了移民无形损失的概念，分析了其构成、特点，以及研究移民无形损失的理论与现实意义，并对移民无形损失进行了定量研究。

2·However, the direct loss as well as the invisible harm caused by aviation calamity is shocking by the sight.

然而，航空灾害所造成的人身财产损失和无形的危害触目惊心。

3·The principle of primary air curtain machine is to move the wind wheel rolling stock motor, a door to the weak invisible space room heating and cooling, heating and cooling to prevent loss.

风幕机的原理首要是以电机股动风轮滚动，构成一道微弱无形的风门来间隔室内的冷暖气，防止冷暖气的丢失。