所有这些都与旧的设备兼容，只要只有一个权威的计时器；但随着城市的发展和时间信号的倍增，报时的差异导致了不和与冲突。

All this was compatible with older devices so long as there was only one authoritative timekeeper; but with urban growth and the multiplication of time signals, discrepancy brought discord and strife.

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因为这与从非兼容浏览器中隐藏脚本的传统方式是相冲突的。

Because it interfered with the traditional way of hiding scripts from noncompatible browsers.

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因此，如果统计数据不准确或者过期，或者冲突，优化器会对查询计划中各步骤的成本评估不准确，从而导致糟糕的性能。

Consequently, if the statistics are inaccurate, outdated, or conflicting, the optimizer will create inaccurate estimates for the costs of the steps in a query plan, leading to poor performance.

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