它们中的一些可能是顺时针旋转的，在这种情况下，根据右手定则，我们认为它们是向下旋转的。

Some of them might be spinning clockwise, in which case, according to the right-hand rule we would consider them spin-down.

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在这个问题上也有一些相反的情况。

There were several circumstances going against them in this one.

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在这种情况下，一些显然的分组可能包含不考虑标准的类。

In this case, some apparent grouping may contain classes that do not respect the criterion.

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