经过

pass; clear; follow; navigate; sweep; go by; pass by; pass through; course; passage; passing; by; past; through; via; by way of

许多

many; much; full; numerous; multiple; countless; galore; a lot of; lots of; loads of; plenty of; many a; quite a lot; a great many; a good deal; in quantity; by the score; lot; lotta; host; load; mountain; mass; mess; stack; ton; pile; rash; heap; mound; slew; raft; lashing; scads; shedload; hundred; million; deal; score; dozen; bare; tons

波折

setback; twist; complication; vicissitude; upheaval; adversity; obstacle