The opposite of " carry-on" would be your " checked luggage."

“随身携带” 的反义词是“托运行李” 。

Your " checked luggage" is the luggage that is down below, underneath the airplane.

您的“托运行李” 是飞机下面的行李。

When you put luggage underneath the plane, we say that you have " checked" your luggage.

当你把行李放在飞机下面时，我们说你已经“检查”了你的行李。

I'm sorry, sir. Airline policy allows only two pieces of checked luggage, at twenty kilograms each, plus one piece of carry-on luggage. I will have to charge you extra for the additional suitcase.

先生不好意思，航空公司规定只允许托运两件行李，每件20公斤，再加一件随身行李。而外的手提箱将另外收费。

I’m sorry, sir. Airline policy allows only two pieces of checked luggage, at twenty kilograms each, plus one piece of carry-on luggage. I will have to charge you extra for the additional suitcase.

先生不好意思，航空公司规定只允许托运两件行李，每件20公斤，再加一件随身行李。而外的手提箱将另外收费。