西瓜撞地球英语怎么说

"西瓜撞地球"（watermelon hitting the earth）是一个比喻，用来形容一件事情出乎意料或者不可能发生的情况。这个比喻的来源不是很清楚，但是可能源自于俗语 "rarer than hen's teeth"（比母鸡的牙齿还罕见）。

下面是一些例句：

"Winning the lottery is about as likely as a watermelon hitting the earth."（中文翻译：中彩票的概率就像西瓜撞地球一样渺茫。）
"I thought the chance of him showing up was about as likely as a watermelon hitting the earth, but there he was."（中文翻译：我原以为他出现的可能性就像西瓜撞地球一样渺茫，但他确实出现了。）
"The odds of me getting a perfect score on this test are about as likely as a watermelon hitting the earth."（中文翻译：我在这场考试中得到满分的可能性就像西瓜撞地球一样渺茫。）