多层涂层
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gradient-layer coating
梯度层涂料
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Hydroxyapatite composite coatings were classified into three kinds according to their feature, i. e. single layer composite coating, double layer composite coating and gradient composite coating.
将羟基磷灰石复合涂层按照特征分为三类，即单层复合涂层、双层复合涂层和梯度复合涂层。
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