姐妹: sisters, siblings, sister (school, city etc)...
承包: to contract, to undertake (a job)...
大选: general election...
湿润: moist...
夜以继日: night and day (idiom); continuous strenuous effort...
意想不到: unexpected, previously unimagined...
炸弹: bomb...
景观: landscape...
举足轻重: to play a critical role (idiom), influential...
大脑: brain, cerebrum...