1. 双层公共汽车
A double-decker or a double-decker bus is a bus that has two levels, so that passengers can sit upstairs or downstairs.

2. 双层结构的;两层的
Double-decker items or structures have two layers or levels instead of one.

1. a vehicle carrying many passengers
used for public transport

e.g. he always rode the bus to work

Synonym: busautobuscoachcharabancjitneymotorbusmotorcoachomnibuspassenger vehicle