micro-unmanned helicopter 微小型无人直升机
unmanned micro helicopter 小型无人直升机
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The studies of micro-unmanned helicopter in our country are at the beginning.
目前，国内对于微小型无人直升机的研究仍处在起步阶段。
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The video was shot on Friday by an unmanned micro-helicopter, the Tarantula-Hawk, called the T-Hawk for short.
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