Young children in the UK are being offered protection against chickenpox on the NHS for the first time.
土地登记了，但政策可能随时变化；企业注册了，但规则可能朝令夕改；合同签了，但执行未必稳定。产权的形式建立起来了，但产权保护的实质还不够，产权的安全感却仍然脆弱。这正是秘鲁制度困境的核心所在。
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The crew of the ill-fated Apollo 13: Jack Swigert, Jim Lovell and Fred Haise