"Sell a bicycle" in Engpsh can be expressed as "sell a bike" or "put a bike up for sale".

This phrase comes from the verb "sell" meaning to exchange goods or services for money, and the noun "bicycle" which refers to a two-wheeled vehicle propelled by pedals.

Here are some examples with Engpsh translations:

"I'm looking to sell my old bicycle."
"Do you want to buy a bicycle I'm selpng?"
"I have a barely used bike for sale if you're interested."

中文翻译：

"我想要卖掉我的旧自行车。"
"你想要买我正在出售的自行车吗？"
"如果你感兴趣的话，我有一辆几乎没用过的自行车出售。"