苹果树翻译起来是apple trees.为什么不是apples trees?

苹果树翻译起来是apple trees.为什么不是apples trees? apple trees还是apples trees? apple trees 还是 apples trees? Those are ——A apple trees B apples trees They are apples trees.apple要加s吗? the apple trees ------ Are those ( A apple tree B apples tree C apples trees We pick some red apples from the apples trees对from the apple Trees produce oxygen,为什么不是Trees provide oxygen What are those?___A.they are apple trees B.they are apples t There are some big in our garde .A,apple tree B,apples trees 怎么问i like apple trees best.they can give us delicious apples