keep/hold sth in reserve
in reserve 表示“留作备用、存着不用”，常与 keep、hold 等动词连用。
We keep some cash in reserve for emergencies.
我们留一些现金以备急需。
储备；储备物
reserves — plural of reserve
矜持；拘谨；替补队员；后备队员；保留；限制；公共休闲用地；保留地；候补奖；预备奖
限制
A restriction.
礼节和得体的举止
formality and propriety of manner
保留或留存以备将来使用的东西
That which is reserved or kept back, as for future use.
为将来使用或特定目的保留的东西
something kept back or saved for future use or a special purpose
为娱乐而保留的东西
Something initially kept back for later use in recreation.
仅在球队首发球员被替换时上场的运动员
an athlete who plays only when a starter on the team is replaced
在展览中,表示获奖者在他人被取消资格时将获奖的区别
In exhibitions, a distinction indicating that the recipient will get a prize in the event of another person being disqualified.
抗拒
A resist.
用于电镀物体上的一种准备,以确定沉积的范围
A preparation used on an object being electroplated to fix the limits of the deposit.
He showed great reserve during the formal dinner.
他在这场正式晚宴上表现得非常拘谨得体。
用法提示：这里 reserve 作名词，表示拘谨、矜持的举止。
The company has a cash reserve for emergencies.
公司有一笔应急现金储备。
用法提示：reserve 表示储备物。
The coach decided to bring in a reserve from the bench.
教练决定从替补席换上一名替补队员。
用法提示：reserve 指替补运动员。
in reserve 表示“留作备用、存着不用”，常与 keep、hold 等动词连用。
We keep some cash in reserve for emergencies.
我们留一些现金以备急需。
reserve 作可数名词，用复数 reserves 指某类被留存备用的东西，of 后接储备的内容。
The country has large reserves of oil.
这个国家拥有大量石油储备。
指球队中替补首发球员的队员，常用 come on/play as a reserve 这一说法。
He came on as a reserve in the second half.
他在下半场作为替补上场。
grammar · medium
易错句子The country sits on huge oil reserve.
正确表达The country sits on huge oil reserves.
reserve 作“储备（量）”解时是可数名词，指多批、多处的储备要用复数 reserves；汉语“石油储备”不标单复数，容易漏掉 -s。这里说的是全国的多处石油储备，所以必须用复数。
grammar · medium
易错句子He is quite reserve when he meets new people.
正确表达He is quite reserved when he meets new people.
表示“矜持、拘谨”的是形容词 reserved，在 be 动词后作表语必须用形容词，不能用名词 reserve。汉语“他很矜持”里的“矜持”本身是形容词，若直译成名词 reserve 就出现词性错误。
grammar · medium
易错句子I made a reserve for two at seven.
正确表达I made a reservation for two at seven.
“预订座位、房间”在英语里用 reservation，不用 reserve；reserve 作名词只表示“储备（物）”或“替补队员”，没有“订位”这一含义。汉语“预订”是一个动词，容易不加区分地对应到 reserve。
表现出拘谨
She showed great reserve during the interview.
她在面试中表现得非常拘谨。
储备；备用
We keep some extra money in reserve for emergencies.
我们留一些额外的钱以备急用。
现金储备
The company has large cash reserves to weather the crisis.
该公司拥有大量现金储备以度过危机。
re- (again/back) + serve (keep; save)
re- (back) + turn (to turn)
serv (keep; serve) + -e
储备常用于指军队预备役，与军事相关。
自然保护区是reserve的常见用法，与保护相关。
储备用于紧急情况，如储备物资。
储备指为将来使用而保存的供给品。
在医学上，reserve指维持功能的能力。
备用，储备
We have some extra supplies in reserve.
我们有一些额外的备用物资。
毫无保留地，坦率地
She spoke without reserve about her plans.
她毫无保留地谈论了她的计划。
保留，留作后用
The team held their star player in reserve for the final match.
球队让他们的明星球员留作决赛备用。
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.