The unsteadiness of air becomes prohibitive only if instruments with large focal length are used.

只有在使用长焦距的仪器时,才不允许空气的不稳定.

辞典例句

Pendulum is a unlinear, coupling, variable and natural unsteadiness system.

倒立摆系统是非线性 、 耦合 、 变量和自然不稳定的系统.

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Improper precipation may cause quicksand and result in foundation pit unsteadiness.

由于降水不慎,可能产生流砂,导致基坑失稳.

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Thus eliminating blurring and unsteadiness of the images.

这样就消除了图象的模糊和不稳定.

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