reserve

keep, retain, reserve, preserve, conserve, withhold

这些动词均有“保持，保存”之意。
keep: 最常用词，指长时间牢固地保持或保存。
retain: 指继续保持。
reserve: 正式用词，指为了将来的用途或其他用途而保存、保留。
preserve: 主要指为防止损害、变质等而保存。
conserve: 一般指保存自然资源，保全人的精力、力量等。
withhold: 指扣住不放，暗示有阻碍。

名词 reserve:

1. formality and propriety of manner
   同义词：modesty
2. something kept back or saved for future use or a special purpose
   同义词：backlog, stockpile
3. an athlete who plays only when a starter on the team is replaced
   同义词：substitute, second-stringer
4. (medicine) potential capacity to respond in order to maintain vital functions
5. a district that is reserved for particular purpose
   同义词：reservation
6. armed forces that are not on active duty but can be called in an emergency
   同义词：military reserve
7. the trait of being uncommunicative; not volunteering anything more than necessary
   同义词：reticence, taciturnity

动词 reserve:

1. hold back or set aside, especially for future use or contingency
2. give or assign a resource to a particular person or cause
   同义词：allow, appropriate, earmark, set aside
3. obtain or arrange (for oneself) in advance
4. arrange for and reserve (something for someone else) in advance
   同义词：hold, book

1. As I require money quickly I must draw on my reserve.
   由于我急于用钱，我必须取出存款。
2. Please reserve a seat for me.
   请为我预定一个座位。
3. He still reserved his opinion on some points.
   在一些问题上，他仍然保留自己的意见。

re.serve

v.tr.（及物动词）
re.served,re.serv.ing,re.serves
To keep back, as for future use or for a special purpose.
保留，收藏：保留，如用于将来使用或某一特殊的目的
To set or cause to be set apart for a particular person or use.See Synonyms at book
存下：把或使…分离开来专门留给某人或某用途参见 book
To keep or secure for oneself; retain:
保留，保有：为自己保留；保持：
例句：
I reserve the right to disagree.See Synonyms at keep
我保留持不同意见的权利参见 keep

n.Abbr. res.（名词）缩写 res.
Something kept back or saved for future use or a special purpose.
储备物，收藏：留存下来供将来使用或用于某一特殊目的的东西
The act of reserving.
保留：保留的行为
The keeping of one`s feelings, thoughts, or affairs to oneself.
自我克制：把感受、想法或事情全留给自己
Self-restraint in expression; reticence:
保守；慎言：在表达上的自我约束；沉默寡言：
例句：
.One feels it everywhere, a quality of reserve, something held back.(Rollene W. Saal)
.你到处感到一种拘谨感，受到拘束.(罗里尼W.萨尔)

Lack of enthusiasm; skeptical caution.
矜持，拘谨：缺少热情；带有怀疑的谨慎
An amount of capital held back from investment in order to meet probable or possible demands.
储备金；资本准备金：从投资中留存下来的，为了应付可能发生的需要的一部分资金
A reservation of public land:
保留地：公共土地的保留：
例句：
a forest reserve.
自然森林保护区

An amount of a mineral, fossil fuel, or other resource known to exist in a particular location and to be exploitable:
矿藏量；储量：已知存在于某一地区并要进行开发利用的某一矿产、矿物燃料或其他资源的数量：
例句：
the discovery of large oil reserves.
大量石油藏量的发现

Often reserves
常作 reserves
A fighting force kept uncommitted until strategic need arises.
后备军人：未投入战斗而保留下来直至产生战略性需要的作战力量
The part of a country`s armed forces not on active duty but subject to call in an emergency.
后备部队：一国的不处于积极任务中但在紧急情况发生时随叫随到的分武装力量
adj.（形容词）
Held in or forming a reserve:
贮存的：保留或形成储备的：
例句：
a reserve supply of food.
食品供应储备

<习惯用语>in reserve
Kept back, set aside, or saved.
保留；留出；存留
来源：
Middle English reserven
中古英语 reserven
from Old French reserver
源自 古法语 reserver
from Latin reserv3re [to keep back]
源自 拉丁语 reserv3re [保留]
re- [re-]
re- [加强语义的前缀]
serv3re [to keep] * see ser-
serv3re [保留] *参见 ser-

【引伸】
reserv.able
adj.（形容词）
reserv.er
n.（名词）