We have lived in the same house for twenty years.
我們在同一座房子里住了二十年了。
I was twenty years old and ready for anything.
我當時二十歲，什么都愿意去做。
Twenty guests are enough, I would have thought.
我覺得二十位客人就夠了。
There were twenty or so people there.
那兒有差不多二十個人。
Pick a number from one to twenty.
從一至二十中挑選一個數。