求翻译：从理论游隙减去轴承安装在轴上或外壳内时因过盈配合产生的套圈的膨胀量或收缩后的游隙称做“安装游隙”。在安装游隙上加减因轴承内部温差产生的尺寸变动量后的游隙称做“有效游隙”。轴承安装有机械上承受一定的负荷放置时的游隙，即有效游隙加上轴承负荷产生的弹性变形量后的以便称做“工作游隙”。当工作游隙为微负值时，轴承的疲劳寿命最长但随着负游隙的增大疲劳寿命同显著下降。因此，选择轴承的游隙时，一般使工作游隙为零或略为正为宜。滚动轴承的径向游隙系指一个套圈固定不动，而另一个套圈在垂直于轴承轴线方向，由一个极端位置移动到另一个极端位置的移动量。轴承游隙的选择正确与否，对机械运转精度、轴承寿命、摩擦阻力、温升、振动与噪声等都有很大的影响。如对向心轴承游隙的选择过小时，则会使承受负荷的滚动体个数增多，接触应力减小，运转较平稳。但是，摩擦阻力会增大，温升也会提高。反之，则接触应力增大，振动大，而摩擦阻力减小，温升低。因此，根据轴承使用条件，选择最合适的游隙值，具有十分重要的意义。选事实上轴承游隙时，必须充分考虑下列几种主要因素： 　　是什么意思？

From the theoretical clearance minus the bearings are mounted on shafts or enclosures for interference rings of expansion or contraction after the clearance of known as "installation clearance". Addition and subtraction on the installation clearance for the bearing internal clearance after the size variation of temperature difference generated is called "effective clearance". Installed machinery to bear load placed on the bearing clearance when that effective clearance plus the elastic deformation of the bearing load after the so called "clearance". When the work clearance for slightly negative, bearing fatigue life of the longest but as negative clearance increases fatigue life with a significant drop. Therefore, when you select the bearing clearance, work clearance as zero or slightly positive in General. Rolling bearing radial clearance refers to the one ring stationary, while the other ring in the direction perpendicular to the bearing axis, by an extreme amount of mobile location to another location. Bearing clearance select right or wrong, on machines running accuracy, bearing life, friction, temperature, vibration and noise, and so have a great impact. Select hour as of radial bearing clearance, is subjected to a load rolling number increase, decrease of contact stress, run more smoothly. However, friction will increase, will raise of temperature rise. Otherwise, increase of contact stress, vibration, and the friction drag reduction, low temperature rise. Accordingly, bearing condition, choose the most suitable clearance values, is of great significance. 　　In fact bearing clearance when the election must take full account of the following main factors: