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1. The layer of light liquid is crucial for the operation of the device.
光层液体对设备的操作至关重要。
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2. The layer of light liquid was carefully applied to protect the delicate surface.
光层液体被小心地涂抹以保护那娇嫩的表面。
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3. The layer of light liquid was used as a protective coating on the surface of the material.
光层液体被用作材料表面的保护涂层。