追溯到
【法】 追溯, 回溯到

trace to trace to its source back-to-back back to back come back to earth back to square one back against (on to) back-to-nature go back to come back to life date back to trace back back trace technique back-to-back testing back-to-back circuit back to back diodes back-to-back test back-to-back starting back-to back credit back-to-back method back to back method