Thanks to electrons, it is easy to see if a suspicious visitor's "shadow" checks out.

而多亏了电子科技，如今一个可疑游客的“影子”能否通过核查变得简单起来。

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In the figure, the light check in shadow is surrounded by darker checks. Thus, even though the check is physically dark, it is light when compared to its neighbors.

本图中，处于阴影中的亮色块被暗色块包围，这样，即使它本身的颜色是暗的，它也应该比它周围的色块亮。

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Shadow environment minister Huw Irranca-Davies also approved of the move, insisting that food checks "need to be far more rigorous" than in the past.

BBC: UK

But shadow home secretary Yvette Cooper, who tabled the urgent question, said emails showed that immigration and customs checks were suspended on some private flights this year.

BBC: Minister: Private flight checks not abandoned