The seed has an outer coating that surrounds the genetic material of the new plant, and inside this covering is a concentrated supply of nutrients.
种子有一层外壳，包裹着新植物的遗传物质，外壳内部是集中的营养供应。
Stable physical properties, the outer coating is prone to scratches.
物理性质稳定，外涂膜易出现划痕。
Special steel, galvanized anti-rust treatment, paint outer coating with high resin.
特殊钢板，镀锌防锈处理，外附高级树脂烤漆涂装。
That's because hydrogen peroxide soaks through the protective outer coating of enamel and into the softer layer of dentin underneath, irritating the nerve-rich dental pulp at the core.
这是因为过氧化氢会渗入釉质的外部保护层并进入牙质下面的较为柔软的一层，刺激神经组织比较多的牙髓。
That's because hydrogen peroxide soaks through the protective outer coating of enamel and into the softer layer of dentin underneath, irritating the nerve-rich dental pulp at the core.
这是因为过氧化氢会渗入釉质的外部保护层并进入牙质下面的较为柔软的一层，刺激神经组织比较多的牙髓。
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