天然橡胶 tiānránxiàngjiāo natural rubber Origin Definitions Defs Strokes Stroke Words Sentences Sents 天然 tiānrán adjective natural occurring or produced in nature; not man-made; innate or natural by birth橡胶 橡膠 xiàngjiāo noun rubber rubber; caoutchouc; a highly elastic polymer that is waterproof, airtight, and non-conductive