... back-spin stroke 下旋球 balloon defence 放高球防守 ball projection 抛球 ...
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balloon defence
气球国防
以上为机器翻译结果，长、整句建议使用 人工翻译 。
One of the first examples was the Red Balloon Challenge, staged in 2009 by DARPA, the research arm of the American Department of Defence.
ECONOMIST: Monitor
应用推荐
模块上移
模块下移
不移动