Its usablerange is restricted by reducing performance for a long time.
但长期性能降低限制其在更大范围内使用。
2
But in 64-bit systems, dates are expressed as signed 64-bit integers, which extends the usablerange.
但是在64位的系统中，日期是使用有符号的64位整数表示的，这可以极大地扩充其可用范围。
3
And also, this system design integrates the address storeroom of the main backup station into the whole system, thus enlarging the usablerange of the equipment.