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 。