0 If cancer cells metastasize, they spread to other parts of the body and cause tumours to grow there. -- (癌细胞)转移
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。