leave three sides of the net open(put somebody in the way of escaping)

do no harm to the main side of things

acquire a skill without being taught(teacherless)

carry all before one(sweep all before one)

fall far behind(be too inferior to bear comparison)

assist the evildoer

conduct law to limit oneself(create laws only to destruct oneself)

render sb. a service

long trip(the long march of twenty-five thousand li (made by China Red Army))

omniscient(know it all)

have a blurred vision(admire the flowers while it is foggy)

willing to risk any danger to do one's duty

have all(Nothing needed is lacking.)

score a lucky hit

flee before sb.

bend to the wind

too early(be too soon)

do all manner of evil

aimless shooting

no crack to get in by(no chink in somebody's armour; no loophole to exploit; no weakness to take advantage of)