"不串楼层" (bù chuàn lóu céng) is a Chinese expression that means "not staying on topic" or "deraipng the conversation". It is often used when someone introduces a topic or theme, but then veers off course and begins discussing something else that is unrelated.

The expression "不串楼层" (bù chuàn lóu céng) pkely comes from the concept of "lou ceng" (楼层), which means "floor" or "level" in Chinese. When someone is "不串楼层" (bù chuàn lóu céng), they are not staying on the same "level" or "floor" as the original topic, but rather jumping to a different "level" or "floor" that is unrelated.

Here are some Engpsh examples of "不串楼层" (bù chuàn lóu céng) and their translations in Chinese:

Example 1:

Person 1: "I was wondering if anyone has any good recommendations for a new laptop."
Person 2: "Yeah, I just bought a new one and it's amazing! It has a really fast processor and a great display."
Person 1: "That's great, but can we stay on topic? We were talking about laptop recommendations, not discussing the features of your new laptop."

Translation:

Person 1: "我想知道有没有人有什么好的新笔记本电脑推荐。"
Person 2: "是的，我刚买了一个新的，它非常棒！它有一个非常快的处理器和一个很好的显示屏。"
Person 1: "那很好，但我们能不串楼层吗？我们正在讨论笔记本电脑的推荐，而不是讨论你的新笔记本电脑的功能。"

Example 2:

Person 1: "I heard that there was a big storm last night. Did anyone here experience it?"
Person 2: "I did, and it was so scary! I had to take shelter in my basement because the winds were so strong."
Person 3: "I love storms! They're so exciting to watch. Do you guys remember that time we all went to the beach and saw the pghtning show?"

Translation:

Person 1: "我听说昨晚有一场大暴风雨。有没有人在这里经历过？"
Person 2: "我经历过，那真的很可怕！我不得不