Well, that's because it's actually not a gross constituent unit in a semiotic system, right?

哈哈，这是因为,红灯不是这一符号系统的一个完整单元？

耶鲁公开课 - 文学理论导论课程节选

We know that this dimension is roughly one angstrom unit, right?

我们知道,它的尺寸大概是一埃，对吗？

麻省理工公开课 - 固态化学导论课程节选