如果他在静止的对手背后做掩护，他的位置必须在对手后退一步不接触就能绕开的地方。
If he screens behind a stationary opponent, the opponent must be able to take a normal step backward without contact.
如果他在静止的对手背后做掩护，他的位置必须在对手后退一步不接触就能绕开的地方。
If he screens behind a stationary opponent, the opponent must be able to take a normal step backward without contact.
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