According to past experience, Liu points out, the common situation is, "After creeping up silently and setting up the film equipment, adjusting the lens and sighting the subject you can't move for an hour or two, for fear of frightening the flock away." Without persistence, patience and professional training, it simply can't be done well. And people who become seasick are out of the question.
根據以往的經驗，正常的情況是，「在躡手躡腳架妥攝影器材、調整鏡頭與對準主角後，此後一、二個小時內不能走動，以免驚動鳥群」，劉燕明指出，若無體力、耐心和專業訓練，根本做不好，而會暈船的人也不能考慮。