老师的声音在教室后面几乎听不见。
The teacher's voice was hardly ___audible at the back of the classroom.
教练在最后一秒喊出口令改变战术策略。
The coach shouted ___audibles to change the strategy at the last second.
四分卫在关键时刻喊出了一个调整战术的口令。
The quarterback called an ___audible to change the play at the last moment.
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