cut off切〔隔〕断, 阻碍
例句:Our troops cut off the enemy's retreat.
我们的军队切断了敌人的退路。
2.The extra strength they gave the Allies would play a major part in helping defeat Germany.
play a part起作用
例句:Recent structural changes also play a part.
最近的结构性变化也扮演了重要角色。