Underframing
底层框架的材料或结构部件
🗣️ 情景例句
OK.
好的。
He is showing off his brand-new car.
他正在炫耀新出品的汽车。
and then there are three thousand million other Milky Ways, or galaxies, in the universe.
况且在宇宙中还有30亿个天河，即银河系。