An error has occurred. Please try again. With a Kennebec Journal and Morning Sentinel subscription, you can gift 5 articles each month. It looks like you do not have ...
Why do geese fly in a “V” formation? The main reason is that it conserves energy. Each bird in the line flies slightly higher than the one in front of it and in doing so, it reduces wind resistance.
一些您可能无法访问的结果已被隐去。
显示无法访问的结果
反馈