Innovators are looking for ways to implement blockchains to transform business models in financial services,supply chain,government,healthcare,retail,and many other industries.Blockchain adds value to enterprises by providing the following services：　　透明度　　可追溯性　　提高速度　　降低成本　　透明度　　With the implementation of blockchain,transaction history has become more transparent.Because blockchain is a distributed ledger,all network members share the same updated ledger.Consensus in the network validates the ledger,which means that everyone must agree to it.　　Changing a single record will cause all subsequent records to be modified.Therefore,保存在区块链上的数据是：　　更安全　　准确的　　透明的　　仅对具有访问权限的成员可用　　可追溯性　　2.1示例代码块　　<div class="outer">　　<div class="inner">hello</div>　　<div class="inner">world</div>　　<div class="inner">today</div>　　</div>　　2.2折叠动作　　点击内部代码块，比如点击<div class="inner">hello</div>，让光标保持在这一行。快捷键option+command+[，就可以收缩成：　　<div class="outer">　　</div>　　中间的三行div都被折叠起来。　　tips:如果继续按option+command+[，还会往上一层折叠，<div class="outer">也会被折叠起来。