拉链 (lā liàn): ซิป

The zipper on my jacket got stuck. I tried pulling it for ages but couldn't zip it up, so I had to ask my roommate to take a look.

The zipper on this dress is at the back. When I put it on by myself, I can never reach it and have to ask someone for help.

The zipper on my suitcase suddenly split open, and everything spilled out. I had to buy a new suitcase at the airport on the spot.

My mom fixed the zipper on my backpack. Now it zips smoothly and doesn't get stuck anymore.

When buying pants, you should definitely try the zipper to see if it works smoothly; otherwise, it'll be a hassle if you only discover a problem after getting home.