Because blockchains involve an enormous amount of data regarding previous transactions, the timestamp servers make it incredibly difficult to forge a block chain.
因为链块涉及大量关于以前的交易数据，因而时间戳服务器尽力保护以免盗用行为。
2
The results show that the block PET-PET(PHB60) copolycondensate was obtained duto in melt blending exists transesterification reaction between molecular chains of PET and PET(PHB60).
结果表明PET和PET（PHB60）在熔融时可发生分子链间酯交换，得到有一定嵌段性的共缩聚物；
3
At present, block copolymers containing PCL and PEG chains are mainly prepared by active ionic polymerization using traditional chemical catalysts, some toxic organometallic compounds.