Some values used in that formula may be invalid — for instance, dividing by zero.
该公式中用到的一些值可能是无效的—例如,除数为零。
If an error occurs, i.e., the formula contains invalid data, a continue handler will be activated and a negative default value (-999999999999.99) will be returned.
如果发生错误,比如公式中包含无效的数据,就会激活后续处理程序,并返回一个负的默认值(- 999999999999.99)。
When the formulas are applied, the scale of the observation system due to the large focus aperture Angle must be enlarged, or else the empirical formula will be invalid.
在实际应用中,由于聚焦孔径角加大,观测系统范围也必须相应加大,否则经验公式失效。
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