duration of existence

• 存在期间

duration of existence的用法和样例：

例句

1. During its brief existence, the pion carries momentum from one nucleon to the other.
   在它短暂的存在期间内，它将动量从一个核子带到另一个核子。
2. On the other hand, if you mean duration of existence as an earth feature, then the Appalachians certainly are among the timeless landscapes of the world.
   另一方面，如果你把存在期间看作是地球的特点，那么，阿帕拉契山无疑是在这地球上永恒的自然景观的其中之一。