on foot
走路;步行
holiday ['hɔlədi,'hɔlidei]
n.假日;假期
year [jə:,jiə]
n.年
by [bai]
prep.乘车(船等)
by plane
乘飞机
by ship
乘船
air [ɛə]
n.天空;空气
by air
sea [si:]
n.海,海洋
by sea
take time
花费(时间)
how long
多久