表达 “like watching grass grow” 被用来形容 “做某件事情就像盯着草长大一样，极其枯燥、无趣”。这个表达通常与系动词 “be” 一起使用，即 “be like watching grass grow”。这是一个相当讽刺和幽默的比喻。

例句
I really don’t understand football. It’s like watching grass grow.
我真的不懂足球。太无聊了。

They told us that the teacher’s lectures were like watching grass grow, but she was so amazing and engaging.
他们告诉我们这位老师讲课很无聊，但事实上，她讲得非常棒，十分吸引人。

She said that dinner with me was like watching grass grow. I don’t think there will be a second date.
她说和我一起吃饭特别无聊。看来我们没有再次约会的机会了。