牙齿保护胶是一种薄的塑料涂层，涂在磨牙的咀嚼面上。

Sealants are thin, plastic coatings painted on the chewing surfaces of the back teeth.

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求购30厘米的烤饼盘，带塑料手柄，薄边，最好是不粘涂层的。

I require 30cm crepe pans, with plastic handles and thin rim around the edge ideally with a non-stick finish.

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