Keeps the features of the image while rescaling along a single direction.

当沿单方向剪裁图像时保留图像特性。

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But that doesn't mean you're doomed to always move in a single direction.

但是，这并不意味着您必须按单一方向移动。

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It is not, as globalization critics suggest, a single force pulling in a single direction.

它不是像一些全球化的批评人士所说的一种力量往一个方向前行。

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To those Americans down below, the fire was coming in from every single direction.

WHITEHOUSE: The White House

The currents of history may ebb and flow, but over time they move -- decidedly, decisively -- in a single direction.

WHITEHOUSE: President Obama Speaks to the Australian Parliament

To improve the efficiency of this process, he worked out a way of arranging permanent magnets so as to concentrate their combined fields in a single direction, providing extra oomph.

ECONOMIST: Maglev trains