the apple tree 是苹果树而chemicty factory为什么要改成chemical

一棵苹果树在花园里是 an apple tree in （）garden.括号里填an/the/零冠词?为什么 apple是in the tree还是on the tree 苹果树翻译起来是apple trees.为什么不是apples trees? apple trees为什么在tree后面加s,而apple后面不加呢? The man is too short to catch the apple on the tree,改成同义句 The apple is the tree The government forbad the chemical factory to pour waste int Where is the apple tree? Mrs.Zhou said that the chemical factory produced terrible ga The gas produced from this chemical factory is poisnonous chemical+factory是什么意思 是apples tree 还是apple tree