晚上，我将鸡鸭鹅赶到猪场上面的圈里去，它们的粪便掉下来，刚好落在猪圈里，这些家禽的粪便正好是家畜的良好食物，再加上青草和粮食喂猪，猪不仅长相好，而且肉质优良，营养价值高。
B-Time I-Time O B-Person O B-Thing I-Thing I-Thing O O B-Location I-Location I-Location I-Location I-Location B-Thing B-Location O O B-Thing I-Thing O B-Thing I-Thing O O O O O O O O B-Location I-Location I-Location O O O B-Thing I-Thing O B-Thing I-Thing O O O O O O O O B-Thing I-Thing O O O O B-Thing I-Thing O B-Thing I-Thing O B-Thing O B-Thing O O O O O O O O O O O O O O O O O O O