英语语法分析

But is captived, and proves weak or untrue.

可它也被俘，证明它既软弱又不忠实。

After leaving nest, the captived youth had two high frequency behavior as 18.81%(to comb the wings) and 11.88%(to stretch down both wing and leg in same side).

出飞后笼养雏鸟的“理翅羽”和“一侧翅下展，同时同侧脚下伸”行为频率最高，分别为18.81%和11.88%。