Definition
to hand over your luggage to airline personnel at the airport to be loaded onto the aircraft instead of taking it with you on the flight.
在机场托运行李，交付给工作人员
Before heading to the gate, we need to check our luggage in early.
在前往登机口之前，我们需要提前托运行李。
She always opts to check her bags in early at the airport, so she can avoid hassle during boarding.
她总是选择在机场提前托运行李，这样可以在登机时避免麻烦。
We need to go to the baggage check-in counter to hand our luggage over to the airline.
我们需要去行李托运柜台将行李交给航空公司。