准直仪叶片宽度 Collimator leaf widths
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这样，垂直于叶片移动方向的肿瘤移动通过简单地移动准直仪的主体来适应以便适应于此。
In this way, movements of the tumour that are perpendicular to the direction of leaf motion can be accommodated by simply moving the collimator bodily so as to accommodate this.
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