it does not add up to when

it does not add up to when It does add up to some 21 miles of trails. 翻译it does not hurt to add some humor 急求翻译!My heart is tired,for it does not know when to give up How much does that__________?A.add B.add up C.add to D.add u add,add up,add to,add up to的区别 Whatever I add up to,I'm not her. add up and add up to add up to用法 add ,add up 和 add up to区别 add to/add···to/add up to IT'S NOT UP TO