对大多数的编译器来说，如果使用未初始化的指针，会将指针中存放的不确定值视为地址，然后操纵该内存地址中存放的位内容。
Under most compilers, if we use an uninitialized pointer the effect will be to use whatever bits are in the memory in which the pointer resides as if it were an address.
因为未来的事情是不确定的，估值总是在一定程度上不够精确。
Valuation will always carry a degree of imprecision because anything in the future is uncertain.
第四，您需要用项目的不确定性来平衡项目计划和相关的估值。
Fourth, you need to balance project plans and associated estimates with the uncertainty of a project.
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