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;當場;在決斗
Kevin was always level-headed with both feet on the ground.
凱文總是頭腦冷靜,腳踏實地 。
My son had a tantrum and banged his fist on the ground.
我兒子大發脾氣,一拳捶在了地上 。