These runlevel numbers are on the whole "well-known," in the sense that most of them have very clearly defined meanings.
由于绝大部分运行级数字都定义了明确的含义，因而它们基本上是“众所周知”的。
A lot of people when see all kinds of marked on email or phone APP Numbers "1, 2, 3? N" read not remind of, have a sense of anxiety.
很多人当看到邮箱里或是手机APP上各种标着数字“1、2、3 ？ n”的未读提醒，就有一种莫名的焦虑。
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