A second bone lines the front of the wing, forming a leading edge, similar to an aircraft.

第二根长在翅膀前沿形成了翼前缘，与飞机类似。

The bat's 'thumb' sticks out at the front of the wing. It is free to hold on to trees and walls.

蝙蝠的“大拇指”从翅膀上伸出来。使它们可以在树上和墙上自由攀爬。

As expected they saw a Leading Edge Vortex at the front of the wing.

正如预期的那样，他们在机翼前部看到了前缘涡流。

But sound waves coming off the front of the wings and the sound waves coming off the back of the wings are out of phase with each other.

但是翅膀前面和后面发出的声波彼此不协调。