1·I have not attempted textual criticism.
我没有试图进行考证。
2·Its history is not so longer than Mohenzuo Daluo, but it is the oldest sewer in the east from the historical textual criticism.
虽然比不上摩亨佐·达罗的历史悠久,但从历史的考证看,也许是东方最古老的下水道。
3·How long does electrician textual criticism need?
电工考证要多久?