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1. The doped coating on the surface of the metal is very thin, which makes it easy to scratch.
金属表面的掺杂涂层非常薄，这使得它很容易刮伤。
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2. The new doped coating technology can greatly improve the durability and corrosion resistance of the material.
新的掺杂涂层技术可以大大提高材料的耐久性和抗腐蚀性。
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3. The doped coating is applied by spraying a solution of the desired element onto the surface of theobject.
通过将所需元素的溶液喷涂到物体表面来施加掺杂涂层。