They are mortars , howitzers , cannons , long - range artillery, rocket guns and self - propelled guns.是迫击炮、弹炮 、 浓炮、程火炮 、 箭炮、行火炮.LONG - RANGE FIRE is similar to the way howitzers proceed.流动火箭弹发射车的长程射击与榴弹炮的射击方式类似.Large - ...
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...
这些小猪被从母猪身边带走，好育肥上市。The piglets are taken from the sow to be fattened for market.小猪挤在一起取暖.The young pigs crowded against one another for warmth.小猪喝脱脂乳而且很爱喝.The piglets had the buttermilk and loved it....