Big fleas have little fleas upon their backs to bite them, and little fleas have lesser fleas, and so ad infinitum.
大跳蚤背上有小跳蚤来咬它们，小跳蚤身上的跳蚤也更小，如此无穷无尽。
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Little
大跳蚤背上有小跳蚤来咬它们，小跳蚤身上的跳蚤也更小，如此无穷无尽。