一旦包装箱达到了一定的尺寸，就需要加入更多的木板。
When any type crate reaches a certain size, more boards may be added.
在一定的尺寸范围内，通过超声波探伤可检测到此类缺陷。
From a certain size, defects of this type can be detected by ultrasonic inspection before delivery.
分析发现，只有当孔径大于一定的尺寸(约0 . 2 0个波长)时，天线增益和副瓣电平才会发生明显变化。
Analysis shows that, only when the size of the hole is larger than 0.2 wavelengths will the variation of the antenna gain and the side-lobe level become obvious.
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