when i read the above quote i couldn✀t help but

When I read the above quote, I couldn't help but 意思为： 当我读了上方的说明， 我没得到帮助，但。

当我读上面的引用的时候我忍不住笑了出来。
can't but do，can't help doing和can't help but do都表示忍不住的意思，can't but do和can't help but do后面接不带to的动词不定式，但是can't help doing接动名词的格式，如：
He whispered something in my ear, and I couldn't help laughing.
他在耳边轻声说了几句，我不禁大笑起来。
He whispered something in my ear, and I couldn't but laugh.
他在耳边轻声说了几句，我不禁大笑起来。
He whispered something in my ear, and I couldn't help but laugh.
他在耳边轻声说了几句，我不禁大笑起来。
I couldn't help laughing at the way he pronounced the sound /r/.
他发/r/音的样子，我忍不住要笑。

意思是当我读到以上引述时，我情不自禁地...

重点单词和词组解释如下：
quote
vt. 引述，引用;
vt. 报价; 引述;
vi. 引用;
[例句]He quoted Mr Polay as saying that peace negotiations were already underway.
他引用波利先生的话，说和谈已在进行之中。

can't help but
不得不; 不能不; 必须; 只好;
[例句]I can't help but wonder if this world is crazy.
我怀疑这世界是不是疯了？

汉语意思是：当我读到上述引用时，禁不住... ...

当我读到以上引述，我情不自禁地。。。