...，plek 这一印欧宇根对应着拉丁语的动词plicare，意思是折叠(to fold)，这一动词产生simplex，其字面意思为折叠一次(once folded)，而现代中的 simple 就来源于此。
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Stands alone once folded 折叠后可单独站立
Once folded, the wrinkles are not gone completely unless are ironed out.
一旦折叠起来，连皱纹都没有完全消失，除非得到妥善解决。
Once inside the eye, the folded IOL unfolds, filling the empty capsule.
折叠的人工晶体一旦进入眼内，就会完全展开，从而将空的晶状体囊全部填满。
Proteins, which are the building blocks of life, come in long chains of molecules that work properly only once they have folded into their final, three-dimensional shape.
蛋白质是生命的建造材料，它们是长分子链，只有在这些分子被组合成最终的三维形态时才可正常运作。
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