保持

maintain; keep; preserve; hold; remain; retain; stay; sustain; keep up; persist; poise; maintenance; preservation; retention; conservation; sustenance; maintained; sustained; holding

乐观

optimistic; positive; cheerful; hopeful; sanguine; upbeat; bullish; rosy; optimistically; positively with optimism; optimism

心态

mentality; psychology; mindset; frame of mind; spirit; psyche; pulse; mood; state of mind