translation.en: We've had to overcome challenges like keeping the weight below the light sport limit that I talked about, figuring out how to politely respond when a regulator tells you, "But that won't fit through a toll booth with the wings extended --  to all of the other associated durability and engineering issues that we talked about on the ground.
translation.zh: 我们必须得克服各种挑战 比如我提到的轻航机的重量限制 还有怎样不失礼貌地回答 监管单位的官员的问题 “可是要是机翼不收起来就过不来收费站啊”  还有许多许多刚才提及的耐用性和 地面机械工程的问题