43 census count 人口普查 44 certain inevitable 不可避免地 45 change convert 兑换 46 childish immature 幼稚 47 china porcelain 瓷器 48 collaborating cooperating 合作 49 collide with run into 碰撞 50 compactly densely 密集地 51 compel force 迫使 52 complain feel unhappy 抱怨 53 comprehend understand 理解 54 confidential secret 秘密 |