Subadditive
次加性(的), 副添加剂
🗣️ 情景例句
Mom,
妈，
Heaven helps those who help themselves.
天助自助者。
The plane was then able to rise and it cleared the mountains by 400 feet.
于是飞机可以上升了，它在离山头400英尺的高度飞越了过去。