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A normal heart has a smooth lining, making it difficult for bacteria to stick to it.
正常心脏有平滑的内膜，使细菌很难在上面附着。
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Smooth leather lining provides moisture-wicking control to keep feet cool and dry.
光滑的皮革衬里提供排汗的控制，以保持脚的凉爽，干燥。
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Smooth cotton lining to keep feet feeling comfy.
光滑的棉衬里，以保持双脚感觉舒适。
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