英文關鍵字
cctv
subway
winter
train
trains
snowy
snow
tracks
frozen
cold
carriage
carriages
city
town
transport
public
mass
transit
surveillance
surveilling
system
surveil
surveils
snowfall
snowing
freezing
december
vancouver
canada
canadian
american
america
york
nyc
overground
ground
track
security
evidence
police
cops
crime
criminal
people
person
camera
fast