Question

上场上场[shàng chǎng]1.■ （演员出场） appear on the stage; enter:她在第二幕时才上场。She doesn't go on until the second act.2.■ （运动员出场） enter the court or field; join in a contest; take part in the competition:双方运动员都已上场。Players of both teams have entered the court.

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常用词组1.■上场门 entrance (of a stage);2.■上场阵容 {体} first team; first string; starting lineup