阈限性是两个阶段之间的过渡状态，个体不再处于前一个状态，但尚未进入下一个状态。

Among thousands of people, you meet those you've met. Through thousands of years, across the boundless wilderness of time, you happen to meet them, neither earlier nor a bit too late. There is nothing to be said except to ask lightly, "Oh, you're here too?"