The output of animal by-products rose by a substantial margin. In 1991, the total meat output stood at 91,000 tons and the total output of milk reached 177,000 tons.是什么意思_The output of animal by-products rose by a substantial margin. In 1991, the total meat output stood at 91,000 tons and the total output of milk reached 177,000 tons.在线翻译_英语_读音_用法_例句