Well there will be grindable skills such as repair or camo and active skills such as clutch braking for example.
会有需要练经验升级的技能，比如修理和隐蔽，以及如离合器刹车这样的主动技能。
After grinded by STM Vertical Mill, physical characteristic is changed and their grindable characteristic is improved greatly.
经过STM立磨处理后的物料物理性质得到改变，物料的易磨性能显著提高。
Grindable skills work passively, sixth sense for example you do nothing to use it but active skills you need to manually activate, they would work for a short period and there will be a cooldown.
需要经验的技能是被动的，比如灯泡技能，你啥都不用做就能起效。 但主动技能需要人工激活，在短时间内有效，且有冷却时间。
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