氧是物质世界的重要元素之一，它的化学性质很活泼。
Oxygen is one of the important elements in the physical world, which is very active chemically.
氧是物质世界的重要元素之一，它的化学性质很活跃。
Oxygen is one of the import elements in the physical world. It is very active chemically.
淀粉独一无二的物理化学性质和营养质量使它区别于其它碳水化合物。
Starch's unique chemical and physical characteristics and nutritional quality set it apart from all other carbohydrates.
应用推荐