Indefinite article: used to indicate that a thing is not identified as unique.
不定冠词：用于指定不特定不唯一的东西。
2
The good thing is that stasis can be held upright for indefinite time, without any damage or problem.
好处是停滞状态可被无限期的保持存在，没有任何损害或问题。
3
Indefinite pronouns are words that replace nouns; they refer to an identifiable but not specified person or thing, expressing the idea of all, none, any or some.