In practice ,a rotor weighing about 10 tons and rotating at 3,000 r .p . m . may be so well balanced that the motion ,except for sound ,is just perceptible.
实际上，一根据重约10吨、每分钟3000转的转子可以平衡得非常好，以致除了响声外，人们几乎觉察不出它是在转动。 [分析]此处just =almost not, hardly 曾误译为“正好觉察得出……”，这样意思就反了
Applying this method to dynamic weighing for automobile, practice indicates the dynamic measurement result is not in accord with the static measurement result, with an error below 1.5%.
将此方法应用于某公路动态汽车衡的开发，安装路试表明，动态测量与静态称重的吻合度控制于1.5%以内。
Taking four weighing idlers for example, its frequency characteristics are analysed and the analysing results are indirectly certified by practice.
以四托辊秤架为例，计算分析了秤架的频率特性，经实验证明计算结果是正确的。
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