小王必须穿上填了三层棉花厚的衣服和裤子，才能保护自己不至于患上风寒湿。
Wang has to wear three layers of cotton-padded clothes and trousers to protect himself from the cold and dampness.
选择三层结构的BP神经网络，建立镁合金微弧氧化膜厚的映射模型。
The mapping model of film thickness of micro-arc oxidation(MAO) on magnesium alloys is built on BP neural network with three layer structure.
书柜分三层，我把最厚的书放在最上层。
The bookcase has three layers. I put the thickest books on the upper layer.
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