Silicosis is occupational disease for certain, is coal silicon ill?矽肺肯定是职业病, 煤矽病?Attention must be paid on the synergic effect of smoking and silicosis in cancer complication.吸烟和矽肺同时存在时,有必要注意协同作用.Paper describes the thre...
He painted a sign advertising the pups.他画了个（卖）小狗的广告牌。All the pups were having a rough - and - tumble in the garden.小狗都正在花园里又叫又闹.Two thousand grey seal pups are born there every autumn.那里每年秋天有2,000头灰色小海豹出生。The pups played...