【6】natural adj. someone’s action or something is reasonable in the circumstances自然的；things exist or occur in nature and are not made or caused by people天然的
natural economy 自然经济natural rubber 天然橡胶 【同根词】? nature n. 自然；自然界? The most amazing thing about nature is its infinite variet
y. 大自然最让人惊叹的地方在于它的无限多样性。 【应用】? Animals like to live in their ________ natural (nature) state.