防疫: disease prevention, protection against epidemic...
走近: to approach, to draw near to...
世界: world...
优良: fine, good, first-rate...
进来: to come in...
尝: taste; sample; try the flavour (of); savour...
姐妹: sisters, siblings, sister (school, city etc)...
空中: in the sky, in the air...
物资: goods, supplies...
扣: button...
