二福是人名，立刻就不解释了，还他个不靠树的倒立：这里“还”有“还击”(fight back)的意思，但是这个“还”也有展示给他看，炫耀的意思。“个”前面省略了“一”字，有时“一个”也可以直接说“个”。“给我一个苹果”和“给我个苹果”意思一样，只是前者更正式，后者偏口头上的。不靠树：不靠着树，不碰到树。不靠树的倒立(handstand)其实就是只用手把身体撑起来，不用靠着别的东西。

obviously they two are making a competition with the 倒立. 倒立 means stand upside down (with your hands) to keep balance, 小柱子 puts his feet against a tree. But 二福 doesn't. It means 二福 can keep balance on his own. This is harder.-----靠树的倒立 vs 不靠树的倒立 I said it was a competition because this word: 还 In this case, 还 means repay / fight back for example, 我军昨天刚刚夺取了这片阵地，今天敌人就立刻还了我们一个大反击。 there is a 成语：还以颜色 颜色 means color. it has another meaning: 厉害 for example, someone hits you. you could say: 我要给你点颜色看看. Then you kill him~~~lol

二福 立刻 还 他 个 不靠树的 倒立。 Er-Fu immediately got back his non-touching tree upside down position

二福做了个不靠树的倒立给小柱子看 不靠树的倒立，二福真厉害