It looks as though the cold, unfeeling ultrasound scanner is no more accurate than the hoot of the owl, so Sun suggests that large hospitals might try planting a few trees in their grounds to attract some owls--perhaps in this way they could save some costs.
看來，貓頭鷹叫聲既不似超音波儀器那麼冷冰冰，判定性別也不比超音波差，他倒是想建議各大醫院多種些樹，養幾隻貓頭鷹，說不定更能節省醫院成本。