耐折的英文：
hard fold

参考例句：

Folding endurance: Measure of deterioration of paper along a constantly repeated fold.
耐折度:量度纸张对经常重复屈折的损坏程度。

hard是什么意思：
adj. 硬的，坚固的；困难的；有力的；冷酷无情的
adv. 努力地；困难地；严重地，猛烈地

It is hard to conclude.
这很难断定。

It is blowing hard.
风刮得很大。

It was sleeting hard.
雨雪霏霏。

To bear hard upon;press.
使痛苦不堪对某人施加困难；逼迫

press hard upon
进逼|压迫|穷追

fold是什么意思：
v. 折叠，对折；交叠；包；失败，垮台，关闭
n. 褶痕；褶皱；羊圈

Parallel fold: Folding a sheet with all the folds parallel to each other.
平行折:纸张的一折和前一折平行的折法。

Cross fold: A fold at right angles to the direction of the web.
横摺:与纸卷成直角的屈摺。

To coil or fold or cause to coil or fold in overlapping whorls.
卷绕(使)盘绕起来或(使)卷起成重叠的螺旋状物

A wrinkle, ripple, or fold.
皱纹，波状，褶痕

The flap folds down.
帽边可以折下。