0 a situation in which the value of goods a country exports (= sells to other countries) is greater than the value of goods it imports (= buys from other countries), or the size of this difference -- 贸易盈余,贸易顺差
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。