他的合同里有一条禁止交易条款，确保他不会被交易到其他球队。

His contract contains a ___no-trade clause to guarantee he won't be traded to another team.

由于系统故障，交易所启动了15分钟的禁止交易机制。

Due to a system failure, the exchange activated a 15-minute ___no-trade period.