聚精会神: to concentrate one's attention (idiom)...
箱子: suitcase, chest, box, case, trunk...
定论: final conclusion, accepted argument...
原因: cause, origin, root cause, reason...
聋哑: deaf and dumb...
唯独: only, just (i.e. it is only that...), all except, unique...
挺拔: tall and straight...
瓜子: melon seed, seeds of pumpkin, watermelon or sunflower etc, roasted and flavored, consumed as a snack...
拥挤: crowded, to throng, congestion...
密: secret, confidential, close, thick, dense...
