Moments later Julia crested the hill and smiled with relief.

片刻之后，朱莉娅爬上了山顶，如释重负地笑了笑。

After the coaster crests the initial lift hill, it begins an expertly engineered cycle – building potential energy on ascents and expending kinetic energy on descents.

在过山车到达最初的升力山顶后，它开始了一个专业设计的循环—— 在上升时积累势能， 在下降时消耗动能。