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1·She explained that they would prevent me from holding my hands in a stressful position, and allow my arms to heal overnight.

她解释说这样就能防止我的手处于一个压迫的姿势，让我的胳膊能在晚上恢复。

2·It refers to the maximum limits which give the dealer the right to carry positions overnight. It removes the obligation to square the position every day.

指交易员在营业范围之外，被允许持有的最大净额，该限额消除了交易当天必须交割平仓的规定。