0 a person who watches what happens but has no active part in it -- 觀察者,觀察家
observers of the political situation/political observers 政治觀察家
UN observers are monitoring the ceasefire. 聯合國觀察員在監督此次停火。
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
再长的路,一步步也能走完,再短的路,不迈开双脚也无法到达。