“关键的是不能只为你的企业用正确的策略，而是要确保你有度量到位，使你知道这是正确的策略”，她说。
"What's critical is not just using the right strategies for your business, but to make sure you have the metrics in place so you know these are the right strategies," she says.
此行应该确保instance只为null或引用一个构造完整的Singleton对象。
This line is supposed to ensure that instance will only ever be null or refer to a fully constructed Singleton object.
我会建议你不时地重新观察它，虽然只为了确保你是对的。
I would suggest revisiting it now and then, though, just to make sure.
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