天然的的用法和樣例：
例句
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洞向地表開(kāi)有出口的地下的或通向地內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. -
角狀物天然的或合成的，類(lèi)似于角質(zhì)物的物質(zhì)
A natural or synthetic substance resembling this material. -
鉆石小的天然的或人造寶石，用作手表中的軸承
A small natural or artificial gem used as a bearing in a watch. -
有些昆蟲(chóng)有一種天然的保護色可以防止敵人的襲擊。
Some insect have a natural camouflage which hide them from the attack of their enemy.
