优良: fine, good, first-rate...
表情: (facial) expression, to express one's feelings...
盟友: ally...
奖金: premium, award money, bonus...
传单: leaflet, flier, pamphlet...
国旗: flag (of a country)...
微博: microblogging, microblog...
失效: to fail, to lose effectiveness...
插图: illustration...
速度: speed, rate, velocity, (music) tempo...
