Billions of dollars in securities are traded each day with nothing more than an implicit agreement that trading partners will pay up when asked.
每天，价值数十亿美元的证券都基于一个不成文的协议而流通，即要时刻满足兑现要求。
Billions of dollars in securities are traded each day with nothing more than an implicit agreement that trading partners will pay up when asked.
每天，价值数十亿美元的证券都基于一个不成文的协议而流通，即要时刻满足兑现要求。
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