時間膠囊；時代文物密藏器（常深埋地下，供後人了解之用）In the U.S., some people use time capsules to predict the future. These people write their predictions of the future on a piece of paper, have the paper buried underground, only to be reopened one hundred years later. 在美國，有些人喜歡用時間膠囊來預測未來。這些人把他們對未來的預測寫在紙上，埋在地裡。一百年之前才能打開。
