especially

https://www.merriam-webster.com/dictionary/especially

特别地

尤其

1 : specially sense 1   // 特殊地 2 a : in particular : particularly food seems cheaper, especially meats b : for a particular purpose built especially for research 3 —used as an intensive  // 语气上的强调
        an especially good essay         nothing especially radical in the remarks  

He was especially concerned about the contract.

There is nothing especially radical about that idea.

Winning this tournament was especially satisfying.

I made this pie especially for you.

 

special

1: distinguished by some unusual quality   // 量值上的特殊
      especially : being in some way superior our special blend 2 : held in particular esteem a special friend 3 a : readily distinguishable from others of the same category : unique they set it apart as a special day of thanksgiving b : of, relating to, or constituting a species : specific   4 : being other than the usual : additional, extra 5 : designed for a particular purpose or occasion

 

particularly

https://www.merriam-webster.com/dictionary/particularly

特别

Definition of particularly

1 : in a particular manner : in detail 
2 : to an unusual degree   // 不寻常的程度
      a particularly dry summer        particularly stormy weather 3 : in particular : specifically The tools were useful, particularly the knife.   Pay particularly close attention to the second paragraph. all of you, but particularly anyone with a problem, should feel free to contact me at any time

 

来源于词根 particle

Particle

    微小的量， 颗粒。 衍生出 particularly 针对颗粒来说， 意味着需要特殊对待。

Definition of particle

1a : a minute quantity or fragment b : a relatively small or the smallest discrete portion or amount of something 2 archaic : a clause or article of a composition or document 3 : any of the basic units of matter and energy (such as a molecule, atom, proton, electron, or photon) 4 : a unit of speech expressing some general aspect of meaning or some connective or limiting relation and including the articles, most prepositions and conjunctions, and some interjections and adverbs the particle up has a perfective meaning in phrases such as beat up and cut up 5 : a small eucharistic wafer distributed to a Roman Catholic layman at Communion