They've begun making progress on the mathematics to prove that the shapes they're folding can actually be made with the crease patterns they're using.

他们用数学来证明他们使用的折痕模式能够真的造出他们正在折叠的形状，并取得了一定进展。

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Not if you dare do it, "she answered, with such fine intrepidity that I was silent, and began to crease patterns on the cloth with my thumb-nail."

“如果你敢，不晚。”她以一种那么优美的无畏回答道。我沉默了，开始用指甲弄皱桌布上的图案。

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