smooth,flat plane
【光滑平坦的平面】
plane
平面,飞机
Whether you buy whole, 2 percent, or skim, the plastic containers milk comes in all share something in common: There's an inverted circle built into one side of the jug where a smooth, flat plane would normally be.
无论你买全脂、2%还是脱脂牛奶,这些塑料容器都有一个共同点:罐子的一侧有一个倒圆,通常是一个光滑的平面。如果你喝牛奶,你可能已经看到了这一点,但你可能不知道设计背后的巧妙原因。