天然的的用法和样例：
例句
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洞向地表开有出口的地下的或通向地内的中空或天然的通道
A hollow or natural passage under or into the earth with an opening to the surface. -
角状物天然的或合成的，类似于角质物的物质
A natural or synthetic substance resembling this material. -
钻石小的天然的或人造宝石，用作手表中的轴承
A small natural or artificial gem used as a bearing in a watch. -
有些昆虫有一种天然的保护色可以防止敌人的袭击。
Some insect have a natural camouflage which hide them from the attack of their enemy.
