On ultra precision cutting, grinding and non-traditional machining, there is a hard problem between long travel and high precision, especially in multi-coordinate machining.
在超精密切削、磨削、特种加工中，大行程驱动与高精度进给是难以解决的矛盾，也是多坐标超精密加工的难点。
Ultra hard, ultra-hard problem, let me awake at night, do not know which heroes are sleeping.
超难，超难的问题，让我夜不能寐，不知道哪位大侠有安眠药。
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