Without a thin, stiff leading edge, they may have been too weak for flight.

由于缺少薄而硬的前缘，这些羽毛也许不够牢固，因而无法用于飞行。

youdao

Without a thin, stiff leading edge, they may have been too weak for flight.

由于缺少薄而硬的前缘，这些羽毛也许不够牢固，因而无法用于飞行。

youdao