0 to surround someone and prevent them from moving or doing what they want to do -- 包围,限制(某人)
When they reached Trafalgar Square, the demonstrators were hemmed in by the police. 当他们到达特拉法加广场时,示威者们已被警方包围起来了。
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。