Double triangle boom is a kind of directly positioning mechanism, it can remove the drill rod to a target position directly in its operating range.

双三角钻臂属于直接定位钻臂，在工作区间可将钎头直接移位到目标位置。

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Mr. SIEGLER: Back at the reintroduction site, Bob Leachman says the black-footed ferret's survival depends on how intense the drilling is, and he believes there's every indication given the current boom, that big trucks, drill rigs and roads will soon dot stop this landscape.

NPR: Drilling to Begin in Colorado Ferret Habitat