natural man-made rubber

例句：

1. 1. Theman-made diamond is more valuable thana natural one.
   人造钻石比天然钻石更有价值。
2. 2. The man-made bridge wasbuilt to replace the old wooden one.
   这座人造桥是为了取代旧木桥而建造的。
3. 3. The man-made product hasbeen praised for its durability and efficiency.
   这种人造产品因其耐用性和效率而受到赞扬。