BBC地平线系列：扮演上帝——合成生物学前沿

     Adam Rutherford meets a new creature created by American scientists - the spider-goat       It is part goat, part spider, and its milk can be used to create artificial spider's web       　　It is part of a new field of research, synthetic biology, with a radical aim: to break down nature into spare parts so that we can rebuild it however we please       　　This technology is already being used to m