<單字複習>
已選單詞
aircraft
airline
airport
ambulance
bicycle
boat
bridge
bus
car
crossing
driver
ferry
flight
garage
gas
gasoline
helicopter
highway
license
MRT
passenger
pedestrian
plane
railroad
road
ship
subway
traffic
train
transportation
truck
tunnel
underpass
vehicle
walk
walking
wheel
wheelchair
yacht
zebra
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