The precision instrument must be kept free from dust.
精密仪器必须保持无尘。
The substrate must be dry, solid, and free from dust.
墙面基层必需干燥、牢固、无尘埃。
We put our books in bookcase to keep them free from dust.
我们把书放进书柜目的不落上灰尘。
Refrigerator glasses should be clean, spotless and free from dust.
冰箱里的玻璃杯必须保持清洁，无污点并没有灰尘。
Refrigerator glasses should be clean, spotless and free from dust.
冰箱里的玻璃杯必须保持清洁，无污点并没有灰尘。
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