改善

improve; ameliorate; better; enhance; upgrade; refine; rectify; reform; elevate; optimize; enrich; advance; boost; uplift; perfect; polish up; make better; make improvements to; improvement; amelioration; betterment; enhancement; upward

相互

mutual; two-way; reciprocal; mutually; together; reciprocally; inter-

关系

relationship; relation; link; connection; bearing; relevance; concern; tie; tie-up; bond; interaction; matter; correlation; nexus; association; correspondence; tie up; make a difference