1975年，美军从越南撤退，并没有明显的迹象表明多米诺牌倒了；相反的却是，柏林墙最终倒了。

No significant dominoes fell after U.S. troops withdrew in 1975, however, and it was the Berlin Wall that eventually toppled instead.

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这是因为虽然巴士的尾部就像一面刚性墙一样坚固，但是前盖却没有强有力的支撑，因此能承受的力量明显减小。

While the rear bus end works as a rigid shear wall, the front cap part is weakly supported and it exhibit significantly smaller strength.

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