形容詞 apart:

1. remote and separate physically or socially
   同義詞：isolated, obscure
2. not living together as man and wife
   同義詞：separate, separated
3. having characteristics not shared by others- Vannever Bush

副詞 apart:

1. separated or at a distance in place or position or time
2. not taken into account or excluded from consideration
   同義詞：aside
3. away from another or others
4. placed or kept separate and distinct as for a purpose
   同義詞：aside
5. one from the other
6. into parts or pieces
   同義詞：asunder

1. He took my essay apart but I found his criticism helpful.
   他把我的文章狠狠地批評了一頓，但我認(rèn)為他的批評有好處
2. The two villages are three miles apart.
   這兩個村子相距三英里。
3. He took the watch apart to repair it.
   他把手表拆開來修理。
4. I can't tell the twins apart.
   我辨認(rèn)不出這對雙胞胎。

a.part

adv.（副詞）

At a distance in place, position, or time:
相隔，相距：在地點，方位或時間上成距離：
例句：
railings spaced two feet apart; born three years apart.
欄桿之間相距兩英尺；出生相隔三年

Away from another or others:
分散地，分開地：與另一個或其它的分開：
例句：
grew apart over the years; decided to live apart.
幾年來獨自成長；決定離群索居

In or into parts or pieces:
成部分，成碎片：
例句：
split apart.
裂成碎片

One from another:
分辨：與另一個區(qū)別開：
例句：
I can`t tell the twins apart.
我無法區(qū)分這一對雙胞胎

Aside or in reserve, as for a separate use or purpose:
擱置，保留：為另一用途或目的分開或保留：
例句：
funds set apart for the project.
為這項工程撥出的資金

As a distinct item or entity:
有區(qū)別地：不同的項目或?qū)嶓w：
例句：
Quality sets it apart.
質(zhì)量使其與眾不同

So as to except or exclude from consideration; aside:
撇開，排除在外；在一旁：
例句：
All joking apart, I think you`re crazy.
撇開玩笑不談，我認(rèn)為你是發(fā)瘋了

adj.（形容詞）
Set apart; isolated. Used after a noun or in the predicate:
分離的；隔離的：分離的；隔離的。用于名詞后或謂語中：
例句：
a people who have existed over the centuries as a world apart.
作為與世隔絕的民族已經(jīng)存在了幾個世紀(jì)了

來源：
Middle English
中古英語
from Old French a part
源自 古法語 a part
a [to] from Latin ad- * see ad-
a [向，去] 源自 拉丁語 ad- *參見 ad-
part [side] from Latin pars part- * see part
part [邊] 源自 拉丁語 pars part- *參見 part

【引伸】
apart.ness
n.（名詞）