To build a performance management system is far away from a piece of cake, it is a system engineering. All corporations must set up valid performance management systems, which are suitable for them.

实施绩效管理不是一蹴而就的，它是一项系统工程，企业必须要建立一套符合企业实际的行之有效的绩效考评系统。

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The result is that the compiler can make aggressive inlining decisions to achieve higher performance, then back out those decisions later if they are no longer based on valid assumptions.

结果就是，编译器要进行主动的内联决策，才能得到更高的性能，然后当这些决策依据的假设不再有效时，就会收回这些决策。

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This offers great performance, but it can be somewhat intimidating to write a visitor class to get valid, useful results.

这提供了很好的性能，但是它也可能会对编写一个访问者类以获得有效地和有用的结果造成威胁。

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Landlords who do not have a valid Energy Performance Certificate (EPC) issued by an authorised assessor will be given seven days to provide one.

BBC: Slough landlords checked for energy ratings certificates

Indeed, benchmarks do play a valid role in evaluating the performance of a specific fund manager.

FORBES: Investors Need To Make Money, Not Beat Benchmarks

Anyone responsible for a travelling circus that uses wild animals in a performance will need to hold a valid licence, meet welfare standards and have a retirement plan for each animal.

BBC: Wild animals to be banned from circuses