Do not use variants or the currency data type as parameters or return values.
不要使用变量或货币数据类型作为参数或返回值。
This is because TBCDField uses the currency data type that has a fixed scale of 4 decimal places.
BCD字段类型使用了货币类型，这种类型是小数点后是4位数。
You should also use a Currency data type if you plan to perform many calculations on a field that contains Numbers with one to four decimal places.
若要对包含一到四位小数的数字的字段执行很多计算，也应该使用“货币”数据类型。
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