英文翻译： It was not that he felt any emotion akin to love for Irene Adler.

Irene Adler: 艾琳·艾德勒是一个出现在福尔摩斯故事中的虚构小说人物，她是唯一一个曾经打败过福尔摩斯的女人。

艾德勒1858年出生于新泽西州，在意大利歌剧院负有盛名，后移居伦敦，与一名黑皮肤的美男子结婚。她第一次（也是唯一一次）出现在《波希米亚丑闻》中。

It was not that he felt any emotion akin to love for Irene Adler.
这倒并不是说他对艾琳·艾德勒有什么近乎爱情的感情。
emotion for Irene Adler对艾琳·艾德勒的感情
akin to love (近乎爱情的, 类似于爱情的)作定语修饰emotion.

参考资料：
To Sherlock Holmes she is always the woman. I have seldom heard him mention her under any other name. In his eyes she eclipses and predominates the whole of her sex. It was not that he felt any emotion akin to love for Irene Adler. All emotions, and that one particularly, were abhorrent to his cold, precise but admirably balanced mind. He was, I take it, the most perfect reasoning and observing machine that the world has seen, but as a lover he would have placed himself in a false position. He never spoke of the softer passions, save with a gibe and a sneer. They were admirable things for the observer--excellent for drawing the veil from men's motives and actions. But for the trained reasoner to admit such intrusions into his own delicate and finely adjusted temperament was to introduce a distracting factor which might throw a doubt upon all his mental results. Grit in a sensitive instrument, or a crack in one of his own high-power lenses, would not be more disturbing than a strong emotion in a nature such as his. And yet there was but one woman to him, and that woman was the late Irene Adler, of dubious and questionable memory.

It was that 是表示强调
love for sb对谁的爱
akin 同类的;近似的akin to 与什么相似
这与他对Irene Adler的爱并不是类似的情感

对后面一整句的强调