空中学习
learning───n.学习；学问；v.学习（learn的现在分词）
air───vt.使通风，晾干；夸耀；n.空气，大气；天空；样子；曲调；vi.通风
lifelong learning───终身学习；终生学习
learning tower───学习塔
e learning───n.网络（化）学习；数字（化）学习；电子（化）学习
cooperative learning───合作学习，共同学习
altitude learning───高度学习
disentangled learning───脱节学习
associative learning───[心理]联想学习；联结式学习
Kate guesses that this whole place was once the fresh-air retreat of a tubercular rich person, but now it's a center of child-initiated learning.───凯特猜想这个地方也许之前是个患结核病的富人的休养场所，现在成了由孩子们主导学习的天地。
During this joint training, we have been learning specific techniques to help us brush up on our skills; it will also bring us a marked improvement for air defense capability.───在这次合同训练中，我们学到了那些能够提升我们技战术的方法；这也将为我们的空中防卫能力带来显著提高。
The boys in veteran teacher Aba Wallace’s first grade class at South Kilbourne Elementary in Columbia, South Carolina, are learning to spell the word ‘air.’───在南卡罗来纳州哥伦比亚的南基尔伯恩小学，资深教师华莱士一年级的班里的男孩子们正在学习拼写“air（空气）”。
'I spent a lot of time in the air, learning how to fly. I'm a daredevil.───我花了很多时间去学习驾驶飞机的技巧，对我来说，这是一次很大胆的经历。