The number is in seconds but may be a floating point value.
刷新时间的单位为秒，但可能是浮点值。
What happen when a floating point value is assigned to an integer variable?
当一个浮点型数据赋值给整型变量时会发生？
Reads the current element value as a single-precision floating-point number.
将当前元素值作为单精度浮点数读取。
Reads the current element value as a single-precision floating-point number.
将当前元素值作为单精度浮点数读取。
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