残留: to remain, left over, surplus, remnant...
出口: export...
周末: weekend...
浓重: dense, thick, strong, rich (colors), heavy (aroma), deep (friendship), profound (effect)...
桃: peach...
原理: principle, theory...
索取: to ask, to demand...
北部: northern part...
担忧: to worry, to be concerned...
攻关: to storm a strategic pass, to tackle a key problem...
