1
reagent for sth
for 后接用途或检测对象。
This solution is a reagent for detecting glucose.
这种溶液是检测葡萄糖的试剂。
试剂
先理解核心含义，再看它在真实句子里的用法。
试剂
a chemical agent used in chemical reactions
This solution is a reagent for detecting glucose.
这种溶液是检测葡萄糖的试剂。
用于处理或测试材料、样品、其他化合物或反应物的化合物或化合物混合物
A compound or mixture of compounds used to treat or test materials, samples, other compounds or reactants in a laboratory or sometimes an industrial setting.
用于化学反应的化学试剂
a chemical agent for use in chemical reactions
The lab technician added a few drops of the reagent to the test tube.
实验室技术员往试管里加了几滴试剂。
Before the experiment, we need to prepare the reagent solution carefully.
实验前，我们需要仔细配制试剂溶液。
This reagent changes color when it comes into contact with an acid.
这种试剂接触酸时会变色。
for 后接用途或检测对象。
This solution is a reagent for detecting glucose.
这种溶液是检测葡萄糖的试剂。
chemical reagent 是常见搭配，泛指化学试剂。
The lab stores chemical reagents in a locked cabinet.
实验室将化学试剂存放在上锁的柜子里。
add...to... 表示把试剂加入某物。
Add the reagent to the sample drop by drop.
将试剂逐滴加入样品中。
Not this
We need reagent for the experiment.
Use this
We need a reagent for the experiment.
reagent 是可数名词，单数形式前需要冠词；汉语“试剂”没有冠词，所以容易漏掉 a。加上 a 后句子才符合英语语法。
Not this
This reagent speeds up the reaction without being used up.
Use this
This catalyst speeds up the reaction without being used up.
reagent 指参与化学反应的试剂，会与反应物发生作用；catalyst 才指本身不变、只加速反应的催化剂。所以表示“催化剂”时不能用 reagent。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
化学试剂
Many chemical reagents are dangerous if touched.
许多化学试剂接触会有危险。
分析试剂
The lab ordered several analytical reagents for the experiment.
实验室为这次实验订购了几种分析试剂。
实验室试剂
This laboratory reagent must be stored at a low temperature.
这种实验室试剂必须在低温下储存。
试剂级
Only reagent grade chemicals should be used for precise measurements.
只有试剂级化学品才应用于精确测量。
限制性试剂
The limiting reagent determines how much product forms.
限制性试剂决定生成物的量。
试剂瓶
Pour the solution into a clean reagent bottle.
将溶液倒入干净的试剂瓶中。
发长 /iː/ 音 (如 sea, tea)
Same pattern, same sound
Use reagent naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 reagent 拆成 re + agent：试剂是化学反应里的‘代理人’，在烧杯中替反应出手。
语域：formal 常见场景：化学实验室、科研论文、分析化学检测 reagent 是正式的科学术语，通常用于化学实验、科研论文等专业书面语境；日常口语中较少使用。
发音说明：与 reagent /riˈeɪdʒənt/ 真正押韵的是 agent /ˈeɪdʒənt/（重读元音同为 /eɪ/，后面的 /dʒənt/ 也相同）。注意拼写相近的 regent /ˈriːdʒənt/、detergent /dɪˈtɜːrdʒənt/、urgent /ˈɜːrdʒənt/、tangent /ˈtændʒənt/、sergeant /ˈsɑːrdʒənt/ 虽然都以 -gent/-geant 或类似形式结尾，但重读元音不同，并不与 reagent 押韵。
Dictionary facts from ECDICT, WIKTIONARY.
Watch the sound change