| 单词 | 天然形成 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔carve〕Some of the tunnels in the cliff are natural, some were carved out (= cut into the rock) by soldiers for defensive purposes.峭壁中的一些隧道是天然形成的，一些是士兵们在石头上开凿出来用于防御的。剑桥高阶〔naturally〕Pearls are produced naturally by oysters.珍珠是在牡蛎体内天然形成的。韦氏高阶〔phytoestrogen〕A naturally occurring compound of plants, such as soybeans, or plant products, such as whole grain cereals, that acts like estrogen in the body.植物雌激素，植物固醇，植物性女性荷尔蒙：在植物（如大豆）或植物产物（如全谷类植物）中天然形成的化合物，作用犹如人体内的激素美国传统〔specific〕These values are culturally specific, not naturally given.这些价值观具有文化特征，并非天然形成。牛津搭配Some of the tunnels in the cliff are natural, some were carved out (=cut into the rock) by soldiers for defensive purposes.峭壁上的一些隧道是天然形成的，一些是由士兵们在石头上开凿出来，用于防御的。剑桥国际Some watercourses are constructed and others occur naturally.一些水道是挖出来的，而另一些是天然形成的。剑桥国际 |
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