solely engrossed in one thing; just (one thing, no need to worry about the rest); simply; by all means; please feel free; do not hesitate (to ask for sth)[cedict]
坐
zuòㄗㄨㄛˋ
to sit; to take a seat; to take (a bus, airplane etc)[cedict]
上
shàngㄕㄤˋ
on; on top; upon; first (of two parts); previous or last (week etc); upper; higher; above; previous; to climb; to go into; above; to go up; to attend (class or university); third tone of putonghua[cedict]
火车
huǒ chēㄏㄨㄛˇ ㄔㄜ
train[cedict]
不
bùㄅㄨˋ
(negative prefix); not; no[cedict]
需要
xū yàoㄒㄩ ㄧㄠˋ
to need; to want; to demand; needs; to require[cedict]
你
nǐㄋㄧˇ
you[cedict]
选择
xuǎn zéㄒㄩㄢˇ ㄗㄜˊ
to select; to pick; choice[cedict]
走
zǒuㄗㄡˇ
to walk; to go; to run; to move (of vehicle); to visit; to leave; to go away; to die (euph.); from; through; away (in compound verbs, such as 撤走); to change (shape, form, meaning)[cedict]
哪
nǎㄋㄚˇ
naㄋㄚ˙
něiㄋㄟˇ
how; which[cedict]
(particle equivalent to 啊 after noun ending in -n)[cedict]
which? (interrogative, followed by classifier or numeral-classifier)[cedict]
条
tiáoㄊㄧㄠˊ
strip; item; article; clause (of law or treaty); classifier for long thin things (ribbon, river, road, trousers etc)[cedict]