Frequency. To make yourself less vulnerable in this area, you must differentiate between valid and invalid rejection.

频率在这个领域工作不要太敏感，你需要区分对不同的拒绝进行区分。

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A second major risk area is not validating assumptions early in the development process (which may prove to be invalid when the system is in integration testing, leading to significant rework).

第二大的风险区域就是在开发过程中的早期不去确定假定条件(这可能在系统进行集成测试时被证明是无效的，导致重大的返工)。

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Geometrical optics approach can only calculate the high frequency approach solution of drilling bit vibration source wave equation in non caustic area but it become invalid in caustic area.

由于几何光学法求解钻头震源波动方程的高频近似解有局限性，即在焦散区失效，故只能计算非焦散区的高频近似解。

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