阅读下面的古诗，回答相关问题。
                                                                                                                        桂源铺
                                                                                                                        杨万里
                                                                                               万山不许一溪奔，拦得溪声日夜喧。
                                                                                               到得前头山脚尽，堂堂溪水出前村。