尽管人类发明了合成橡胶，但现在没有能替代天然橡胶的好产品，因为人工合成橡胶弹力和强度还无法和天然橡胶相比。
Despite the invention of synthetic rubbers, there is often no good substitute for the real thing, for nothing artificial yet matches natural rubber's resilience and strength.
用来制造香精的原料包括动植物的天然产品和人工合成的材料。
Raw materials used in perfumery include natural products, of plant or animal origin, and synthetic materials.
细胞工程和遗传工程技术将为人工合成天然活性物质开辟新的途径。
Cell engineering and genetic engineering technology will open up a new route to artificial synthesis of natural active substances.
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