当初 / 只是 / 无心插柳 / 没 / 想到 / 这颗 / 种子 / 竟 / 长成 / 了 / 参天 / 大树

当初只是无心插柳，没想到这颗种子竟长成了参天大树。

It was originally just an unintentional act, but unexpectedly this seed grew into a towering tree.