云层间透出微光，回荡着勇者的心声。宅宅在线下载

　　One moment the sky would be full of aircraft wheeling and positioning for the best shot at the enemy; a sky full of danger and menace. The next instant there would just be a clear blue empty sky with the sun shining down on a calm and beautiful landscape. Such was the phenomenon experienced by pilots who fought in the key battles of France and Britain in the Summer of 1940. The... (展开全部)