Understratum
n. 底層
??? 情景例句
Oh, wait a minute. What's today's date?
噢， 等一等 ，今天幾號？
You can count on us.
你可以信賴我們。
From one's own front door to home or foreign hills or sands and back again, everything is to hand.
從自己的家門出發到國內國外的山區或沙灘上露營然后返回，一切都很便利。