(located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)[cedict]
码头
mǎ tóuㄇㄚˇ ㄊㄡˊ
dock; pier; wharf[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]
观察
guān cháㄍㄨㄢ ㄔㄚˊ
to observe; to watch; to survey; to examine; observation; view; perspective[cedict]