它是一种很重要的解释，而且饱受争议，那就是在战局一个重要的时刻，有一项技术就是一方给对方致命一推。
It's a very important explanation and much debated, that at a critical time in the battle, one technique would be that one side would give one great big shove.
一种情境中有单方威胁——只有一方可以威胁到对方。
One condition had unilateral threat - only one could threaten the other.
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