... persist in doing sth.，坚持做某事。 free from dust，一尘不染。 refer to them as，把他们称作...。 ...
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keep them free from dust 使它们不受灰尘的侵蚀
The most pleasant thing of the rainy season is that one can be entirely free from dust.
雨季最令人愉快的事情是完全没有了灰尘。
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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。
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