Stewarts key instructional point for his receivers was to keep their core muscles tight to
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Stewarts key instructional point for his receivers was to keep their core muscles tight to obtain good balance and resistance to the velocity of the ball throughout the act of catching and securing the ball.
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正确答案：obtain——maintain
obtain表示“得到、获得”，maintain表示“维持、保持”。句中指“在接球和防卫的整个过程中始终保持良好的平衡”，故用后者。