The second economic function provided by futures exchanges is price risk management, also known as hedging.
价格风险管理机制是期货交易所提供的第二个经济功能，即我们通常所说的套期保值功能。
This is also known as "hedging" or "single lock" - the same account opened in the same position more than a single and an empty one.
这也被成为“对冲”或者“锁单”——在同一账户里开设相同头寸的多单和空单。
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