災後重建面臨的一個普遍問題是時間，這對無家可歸的災民尤其重要。
Trial launched to 'help spot health risks early'，更多细节参见WPS官方版本下载
As with crypto-currency, records of who owns what are stored on a ledger that is maintained by thousands of computers around the world. These records can’t be forged because the whole system operates on an open-source network.。91视频对此有专业解读
所以张清森突发奇想，做了一个几乎不算创新但特有效的改动，把线材做成 0.5米，1米，1.5米，2米，3米，5米 等等不同长度，结果自然大受欢迎。