could be written on the back of a postage stamp

短语
中文释义

英文释义

短语
  1. Something that is very small or limited. figuratively
    — "That's the answer," he announced gleefully. "What you don't know about chickens could be written on the back of a postage stamp.

词源

Due to the very small size of a postage stamp. First use appears c. 1905. See cite below.
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