Floating point Numbers are not exact, and manipulating them will result in rounding errors.
浮点数不是精确值，所以使用它们会导致舍入误差。
The actual Numbers are not very useful; they tend to be very inaccurate due to rounding errors.
真正的数字并不是十分有用；由于取整舍入错误，这些数字可能并不是非常精确。
But those Numbers are rounding errors compared to mobile phone sales.
但是这些数目在手机销量上存在或多或少的误差。
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