backdate e追溯到
history backdate历史回溯
the probabilistic backdate illation概率回溯推理
constructing backdate database回溯建库
One-way-Backdate单程回溯
backdate storage of the periodicals回溯建库
V-T（及物动词） If a document or an arrangement is backdated, it is valid from a date before the date when it is completed or signed. (实际生效日) 追溯到
The contract that was signed on Thursday morning was backdated to March 11.
星期四上午所签的合同从3月11日起生效。