Sudden changes, however, are effected during the spring floods, when the snow is melting and the upper tributaries are roaring loud from " bank to brae" .

然而，突然的变化发生在春季洪水期间，此时积雪正在融化，上游支流从“河岸到布雷”大声咆哮。

So Fred was gratified with nearly an hour's practice of " Ar hyd y nos, " " Ye banks and braes, " and other favorite airs from his " Instructor on the Flute;" a wheezy performance, into which he threw much ambition and an irrepressible hopefulness.

因此，弗雷德对将近一个小时的“Ar hy y nos”、“Ye banks and braes”以及他“长笛教练”中最喜欢的曲目进行了练习，感到很满意；气喘吁吁的表演，他投入了雄心壮志和无法抑制的希望。