[music] Hello everyone. My name is Han. I'm from class 5 K4 of Dantium Primary School.Last summer, I and my family have traveled to Taiwan. As you may know, Taiwan is a paradise for bubble tea, and I'm a big fan of it. I tried many different bubble tea shop, but there was something that really surprised me.Every time I order a drink, the seller would ask, "Did you bring your own cup?" At first, I didn't think much about it, but after hearing that question again and again, I started to realize how powerful i ...