useful bird的意思|示意

The owl is a useful bird.

猫头鹰是一种益鸟。

Airplanes do something clumsy, useful and only slightly similar to bird flight.

飞机可以笨拙飞行，很有用，但和鸟类飞行相似仅有一点点。

Similar transfusions might be useful in treating victims of a bird flu pandemic, especially in light of the problems with existing vaccines and treatments, say authors of the Spanish flu study.

西班牙流感研究人员说，尤其是根据现存的疫苗和治疗问题，输血可能类似地有益于治疗禽流感病人。