n.过山车;云霄飞车，许多急转突变;忽好忽坏

The rollercoaster reached its peak, and then dropped suddenly, making everyone scream.
这过山车到达最高点后突然下坠，让所有人都尖叫起来。
Life is like a rollercoaster, with many ups and downs.
生活就像过山车，充满了起起伏伏。
I couldn't stop laughing after the thrilling rollercoaster ride.
激动人心的过山车之旅结束后，我笑得停不下来。
She closed her eyes during the scariest part of the rollercoaster.
在过山车最恐怖的部分，她闭上了眼睛。
The rollercoaster's twists and turns left me feeling dizzy.
那过山车的弯道让我感到头晕。
My heart was pounding in my chest as we climbed to the top of the rollercoaster.
当我们爬上过山车的顶部时，我的心在胸腔里狂跳。
The kids begged their parents for one more turn on the rollercoaster.
孩子们央求他们的父母再让他们坐一次过山车。
The rollercoaster ride was so intense that it felt like time stood still.
那次过山车旅程如此激烈，感觉时间都停止了。
After the rollercoaster, she decided she preferred milder rides.
坐完过山车后，她觉得还是喜欢温和一点的游乐设施。
The rollercoaster at the amusement park has been shut down due to safety concerns.
由于安全问题，游乐园里的过山车已被关闭。