Dialogue 1Jingjing and Mark are chatting on the subway.
京晶和马克在地铁上聊天。Jingjing: Is this seat taken?
Mark: Go ahead. Oh, Jingjing, it's you!
Jingjing: I'm on my way to work.
Mark: Me too, I'm just looking through WeChat moments to pass the time.
Jingjing: Have you noticed any trends in people's posts?
Mark: Yeah. Lately, a lot of people have been posting pictures of when they were 18 years old.
Jingjing: Do you know why that is?
Mark: Let me guess: since it's 2018, someone got the idea, and it went viral.
Jingjing: That's a good guess. This coming year is also the first year that the post-90s generation can no longer call themselves teenagers.
Mark: You know what I noticed about all those pictures?
Jingjing: What was that?
Mark: Fewer of them were selfies.
Jingjing: I don't know if that means people took fewer selfies when they were 18.
Mark: Yeah, I guess if you have a whole year of photos to choose from, you don't have to use a selfie.
Jingjing: The most charming ones are group photos, showing what people were doing when they were 18 years old.
Mark: Right. It's cool to see what hobbies and interests people had when they were younger.
Jingjing: It's a nice trend, looking back on innocent times.
Mark: You said it.
马克：是啊！New words: 习语短语trends 潮流，趋势
something that more and more people are doing (a general change in the way people are behaving, or a behavior that is very common for a short time)
went viral 社交媒体上的快速广泛的传播
spread quickly, especially a video posted on social media
post-90s generation 90 后
people in 1990 or afterwards (but not after 2000)Dialogue 2Later on, a bunch of people get off the subway, and it is quiet enough to talk again.
接下来，一群人下车了，安静得又可以继续聊天Jingjing: Are you still looking at WeChat moments?
Mark: Kind of. I'm having a look at my subscriptions. There's already an article about why people are posting pictures of themselves as 18-year-olds.
Jingjing: Does it give the same reason I told you?
Mark: Yeah, and it talks a little about other social media trends.
Jingjing: Is there a general pattern?
Mark: There might be. You know, each of these trends starts out as a cute joke. It becomes wildly popular, and everyone wants to get involved. Then, a few people make a joke about the joke. Finally everyone forgets about it.
Jingjing: It seems like the 18-year-old posts are still a pretty hot trend. I wonder what the joke could be?
Mark: Well, the article predicts that people will post pictures of themselves at 18-months old, or post pictures of famous people (like Donald Trump or Lù Hán) when they were 18 years old.
Jingjing: Those would be pretty funny.
Mark: There's even a guy that takes old social media trends and makes new videos about them.
Jingjing: How does that work?
Mark: Well, he must have access to the sets at a movie studio. He took the ice bucket challenge, and set it at the time of the Beijing Olympics. Everyone's wearing those volunteer uniforms.
Jingjing: Let me see. Oh yeah, here's another one where people—it looks like the Tang dynasty—are eating fresh dates and bananas.
Mark: That one's good for a laugh. Those videos make it look like he was the one who started each of these trends.
Jingjing: Interesting idea. I wonder what he'd do with the 18-year-old trend.
京晶：好玩的想法。我很好奇重返十八岁他会玩点什么？New words: 习语短语wildly popular 超级流行
so popular that people do/like it without knowing the reason
ice bucket challenge 冰桶挑战
a social media trend, in which people dumped buckets of ice water on themselves and collected money for amyotrophic lateral sclerosis research (aka ALS ice bucket challenge)
good for a laugh 太好笑值得一看
funny, worth seeing/reading just because it's funny