It's the board that you're playing can fold and unfold and refold in all sorts of different ways.

你玩的棋盘可以以各种不同的方式折叠、展开和折叠。

When it fuses with the host cell, the protein " unfolds" from a so-called pre-fusion form to grab hold of the cell membrane, and then " refolds" into a post-fusion shape.

当 RSV 融合进宿主细胞时，融合糖蛋白会从所谓的“前融合”形式展开来抓住细胞膜，之后再折叠成“后融合”形状。

" At school needlework was pretty much the only thing I was any good at." I smoothed out the creases on my lap and prepared to refold a jacket.

针线活几乎是我唯一擅长的事情。 ” 我抚平膝盖上的折痕， 准备重新折叠一件夹克。