A diurnal animal hunts its food during daylight .
白天活動的動物在白晝時獵食。
No diurnal rhythm was detected .
沒有發現晝夜節律。
Over water the diurnal change in refraction is likely to be small .
在水面上,折光的周日變化可能是很小的。
The diurnal springs correspond to the semidiurnal neaps and vice versa .
全日潮大潮對應於半日潮小潮,反之亦然。
The purpose of reoccupations is to keep track of diurnal variations in the earth's field .
重測的目的在於記錄地磁場的日變。