那时，大约二十码外的一辆小型货车后门突然敞开。

At that instant, the rear doors of a panel truck some twenty yards away flew open.

《柯林斯英汉双解大词典》

本文讨论了敞开式桁架弦杆的平面外稳定性计算方法，并给出了计算实例。

The stability calculation of chords on open lattice beyond the main truss plane is discussed in the article. A calculation example is presented.

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