A tandem bicycle is called a "tandem bike" in Engpsh.
It is called a tandem because it has two seats, one behind the other, allowing two people to ride it at the same time. The person in the front seat is usually referred to as the "captain" while the person in the back is known as the "stoker."
The origin of tandem bicycles can be traced back to the late 19th century, when they were popular for leisure riding and racing.
Example Sentences in Engpsh with Chinese Translation:
"Let's go for a ride on our tandem bike this weekend." (让我们这个周末骑双人自行车。)
"My favorite part of riding a tandem bike is being able to share the experience with someone else." (我最喜欢骑双人自行车的地方是能够和别人一起分享经历。)
"Tandem biking is a great activity for couples, friends, or family members." (双人骑自行车是情侣、朋友或家庭成员的一项很棒的活动。)