齿刃可以用磨刀笔磨，而且正常用不需要磨吧

感谢楼上指点

找到权威说法了:NOTE: In mid 2009, Leatherman added half-length blade serrations to standard model and REMOVED them from the CX model. Confusingly, the model numbers were not updated to match the new configurations. Some online retailers may still have the 'old version' still in inventory, but as the model numbers are the same, there's no way of knowing what you'll receive. I contacted Leatherman about this and this is the reply I received:
"Thank you for your email and your interest in Leatherman Tools. Originally our Skeletool had a "straight blade", and the Skeletool CX had a "combo blade". The Skeletool CX has a higher grade of steel in its blade and those in the `knife world' came back to us, and stated that we should not use the combo blade with 154cm material. Therefore, in mid year of last year, we made a design change. ... All Current models of the Skeletool CX now have the straight blade. All current models of the Skeletool have the combo blade. ... There are some retailers out there, who have both in inventory. We did not change the item numbers when we made the blade change. Unfortunately, you will have to just check to see who has what in stock." 英文不行，大概意思是 09年中推出的半齿通过KNIFE WORD（估计是论坛）反馈认为 154CM不应该用在混合刃上面（没说明原因），现在的都是库存，但是编号没改（好像目前还是改了830849变为了830850），看来实用性上折刀刃短半齿发挥不了优势，还是全刃更实用。

看了这位大侠的最后一句，很放心：So that's it. Don't let the Skeletool's small size and feature list deter you; The Skeletool is an extraordinary EDC tool!

154cm齿刃不容易打磨，现在都改为全刃。

对啊，第一款少侠的黑色版就是154的半齿。而且手柄有碳纤维贴片。