单面斜纹织物具有正反面，两面是不能互换的。
Uneven twill fabrics have a right and a wrong side and therefore are not considered reversible.
驱动互换业务进入新的实体可能仅仅简单创造了一种新类型的公司，它们照样会因为太大而不能倒下。
Pushing swaps into new entities may simply create a new class of firms that are too big to fail.
这个步骤不能解决非两对中心互换的情况——除非该魔方被拆散后又被错误地安装过。
They cannot be in any other arrangement unless the puzzle has been taken apart and put together incorrectly.
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