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1.He helped create a company that developed a small drone that could be controlled by people on the ground.
on the ground 在地上；当场；在决斗
Kevin was always level-headed with both feet on the ground.
凯文总是头脑冷静，脚踏实地。
My son had a tantrum and banged his fist on the ground.
我儿子大发脾气，一拳捶在了地上。
