Pairs of opponents hit the ball back and forth until one winner emerges from all who entered.
一组组对手来回击球，直到所有参赛者中出现一名胜利者。
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One, set forth by Aristotle in the fourth century B.C., sees humans as naturally imitative—as taking pleasure in imitating persons, things, and actions and in seeing such imitations.
Facing an $8.3 billion budget deficit this year, closing post offices is one of several proposals the Postal Service has put forth recently to cut costs.