n.胸骨(sternum的复数形式)
网络 燕鸥属; 燕欧属; 援普通燕鸥
In contrast, the flight ability are weakened or lost with the increase of sterna length but decrease in its depth and width.
反之,胸骨的长度加长,深度、宽度渐小的鸟类,其飞行能力较弱或已经丧失飞行能力。