0 angry and unwilling to smile or be pleasant to people -- 愠怒的;闷闷不乐的,绷着脸的
His daughters stared back at him with an expression of sullen resentment. 他的几个女儿也满脸愠怒地狠狠回瞪他。
literary She looked up at the sullen (= dark and unpleasant) sky and shuddered. 她抬头看了看阴沉沉的天空,不由打了个冷颤。
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。