noun 下载 🔗分享 飞艇，气球 An aircraft, such as a dirigible or balloon, that derives its lift from buoyancy rather than from wings or rotors. Examples : "The annual town fair always features a giant aerostat, slowly floating above the crowds and advertising local businesses. " 一年一度的城镇集市总会展出一个巨大的飞艇或气球，它缓缓地漂浮在人群上方，为当地商家做广告。 vehicle technology nautical space military 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 系留气球，系留艇。 A moored balloon flown in a semi-permanent manner, such as a border patrol monitoring balloon affixed at 18,000 feet (~6 km). Examples : "The border patrol used an aerostat to monitor activity along the remote frontier. " 边境巡逻队使用系留气球来监控偏远边境地区的活动。 technology military vehicle government space machine device 与AI对话词汇游戏阅读练习
