求翻译：1、转速与温升：随着科学技术的发展，机床主轴转速越来越高，变速范围越来越大，因此，对轴承高速运转稳定性的要求也越来越高。机床主轴轴承温升是限制轴承转速的重要因素。是什么意思？

, Speed ​​and temperature rise: With the development of science and technology, increasingly high spindle speed, variable speed range is growing, more and more high, bearing high-speed operation stability requirements. Machine tool spindle bearing temperature is an important factor to limit the spee

1, RPM and temperature rise: With the development%