Reaction
[ rɪ'ækʃən ]
第2级
其它 Other
n. 反应;反作用力;反动;保守;
💡 词根助记
re向后，相反+act行动+ion名词后缀→反动，反应
📝 例句
A reaction generally remains fixed in elevation even though it carries a force.
即使承受力，通常反力还是在垂直面内维持固定不变。
In a more complex one-step reaction, bonds both form and break.
在较复杂的一步反应里，既有化学键的形成，也有化学键的断开。
The overall reaction is one of substitutions.
总反应是取代反应中的一种。
Catalysis has increased the rate of reaction.
催化作用提高了反应的速度。
Putting an acid and a metal together causes a reaction.
将酸和金属放在一起会引起反应。
🌱 联想助记
【记】action-作用,reaction-反作用:作用与反作用是相互的
✅ 同义词
🔴 反义词
📖 牛津释义
reaction
n
1 [C, U] ~ (to sb/sth) response to a situation, an act, an influence, etc （对情况、 行动、 影响等做出的）反应, 回应
What was his reaction to the news? 他对这消息的反应如何?
Her arrest produced an immediate/a sudden reaction from the press. 她被捕的事立刻[突然]在新闻界引起反响.
the shocked reaction of schools to education cuts 学校对削减教育经费的激烈反应
Reaction to his taunts will only encourage him. 别理会他恶言寻衅, 一理他更来劲儿.
2 [sing] physical response, usu a bad one, to a drug, chemical substance, etc （由药物、 化学物质等引起的）生理上的反应（通常指不良反应）
an allergic reaction to animals, birds, etc 对兽类、 鸟类等的变态反应
I had a bad reaction after my typhoid injection. 我注射伤寒针剂後产生了不良反应.
3 [sing, U] return to a previous state after a period of the opposite condition 回复到原来的状态; 复旧
After all the excitement there was (an inevitable) reaction, eg a time when life seemed dull again. 热闹一番过後, （不可避免地）又恢复了旧观（生活沉闷如故）.
4 [U] opposition to (esp political) progress or reform 反对（尤指政治的）进步或改革; 反动
The forces of reaction made reform difficult. 反动势力给改革造成了困难.
5 [C, U] chemical change producedby two or more substances acting upon each other 化学反应
nuclear reaction, ie change within the nucleus of an atom 核反应.
🔁 扩展释义
*[ri'ækʃәn]n. 反应, 反作用, 反动【医】 反应
🏥 医学释义
反应，回授，（正）反馈
📖 同为「高中」词汇
查看全部高中词汇 ›🗣️ 情景例句
What can I do for you, sir?
先生，有什么需要帮忙的吗？
I haven't the slightest idea.
我一点儿都不知道。
It's ready.Do you want any milk?
咖啡好了，你要放点奶吗？