Subtracting the lead time from that date yields the the Trigger Point when upgrade work should begin.
从日期字段中减去这个筹建时间，就应该是这个升级应该开始的触发时间。
2
After an evolved fault occurred, the fault superimposed components can be calculated through subtracting the solved load currents from the currents at the measuring point.
发生发展性故障后，利用保护安装处的全电流减去求得的支路电流得到发展性故障后的故障分量电流。
3
Residential construction declined sharply during the quarter, as expected, subtracting about 1 percentage point from overall growth.