第一个“苦”是形容词，困苦的意思，第二个“苦”是动词，使~困苦

就是说无论我们生活怎么艰苦， 也不能让孩子活得艰苦。 比如说有一对夫妇的生活条件很差，收入也不高，但是他们的孩子在生活上有什么需求，比如要交学费，要买新衣服等等， 这时这对夫妇宁可自己节省也要满足他们孩子的需求， 就会说“再苦也不能苦了孩子。”

no matter how hard the life is, the children should not suffer from the hard life.

可說　" 請為我　　說明 / 講解 / 解說　　這個　　句子 / 句型 " 句子結構： 1) 肯定型：... 再　+　Adj / NP　+　(...)　+　也　+　Verb / VP ... 他什麼都吃，[再] 難吃的食物NP 他 [也] 吃Verb 。 He is a food terminator, no matter how unpalatable it may be. [再] 忙Adj [也] 要陪你喝杯咖啡VP 。/* a slogan of some commercial :D */ No matter how busy I am, I would love to keep you company with a cup of coffee. 2) 否定型：... 再　+　Adj / NP　+　(...)　+　也不 / 也不能 / 也不可以 / ...　+　Verb / VP ... 他們 [再] 累Adj [也不] 喊苦Verb 。 They never whined no matter how weary they got. [再] 苦Adj [也不能] 苦了孩子VP 。 Rather be painstaking than leave kids pinched. /* I prefer this one though, due to rhyme */ Strive hard for the sake of children. (No matter) how distressing (our life may be), (we) can't have (our) children distressed (because of it). /* a closer literal translation */ <比較> ... 再也不 / 再也沒　+　Verb / VP ... 自從他女友死後，他就 [再也不] 畫畫Verb 了。 He has stopped drawing ever since his girlfriend died. 他十八歲離家後就 [再也沒] 回來Verb 了。 He left home at 18 and has never come back since.

再苦 no matter how hard it is 也不能 you can't let someone or sth 苦了 suffer 孩子 your children