He circled over the aerodrome.

在小型上空盘旋。

There is no influence of aerodrome on the calibration of airplane radio compass error with aerophotograph, but it causes some effects on measurement accuracy.

空中照相法校正无线电罗差不存在地影响,但在实施过程中,又引入了一些其它影响测量精度的因。