Usage note
这个词用来形容非常重要或影响很大的事情。
Zhège cí yònglái xíngróng fēicháng zhòngyào huò yǐngxiǎng hěn dà de shìqíng.
This word is used to describe something very important or with great impact.
Context note
在学校里，老师经常告诉我们，学习是一件重大的事情。
Zài xuéxiào lǐ, lǎoshī jīngcháng gàosu wǒmen, xuéxí shì yī jiàn zhòngdà de shìqíng.
At school, teachers often tell us that learning is a major thing.
5 examples
这个决定对我们班来说很重大。
zhè ge jué dìng duì wǒ men bān lái shuō hěn zhòng dà。
This decision is very significant for our class.
今天有一个重大的活动。
jīn tiān yǒu yí gè zhòng dà de huó dòng。
There is a major event today.
他的生日是一个重大的日子。
tā de shēng rì shì yí gè zhòng dà de rì zi。
His birthday is a significant day.
这个问题很重大，我们需要认真思考。
zhè ge wèn tí hěn zhòng dà， wǒ men xū yào rèn zhēn sī kǎo。
This problem is major, we need to think carefully.
妈妈告诉我，诚实是一件重大的品质。
mā ma gào sù wǒ， chéng shí shì yí jiàn zhòng dà de pǐn zhì。
Mom told me that honesty is a significant quality.
5 mini stories
小明今天参加了一个重大的比赛。他非常努力，最后赢得了奖牌。
xiǎo míng jīn tiān cān jiā le yí gè zhòng dà de bǐ sài。 tā fēi cháng nǔ lì， zuì hòu yíng dé le jiǎng pái。
Xiaoming participated in a major competition today. He worked very hard and finally won a medal.
学校有一个重大的节日庆祝活动。大家一起唱歌跳舞，非常开心。
xué xiào yǒu yí gè zhòng dà de jié rì qìng zhù huó dòng。 dà jiā yì qǐ chàng gē tiào wǔ， fēi cháng kāi xīn。
The school had a major holiday celebration. Everyone sang and danced together, very happy.
爸爸说，保护环境是一件重大的事情。我们每天都要节约用水。
bà ba shuō， bǎo hù huán jìng shì yí jiàn zhòng dà de shì qíng。 wǒ men měi tiān dōu yào jié yuē yòng shuǐ。
Dad said that protecting the environment is a major thing. We need to save water every day.
小红在课堂上做了一个重大的发言。老师表扬了她。
xiǎo hóng zài kè táng shàng zuò le yí gè zhòng dà de fā yán。 lǎo shī biǎo yáng le tā。
Xiaohong made a major speech in class. The teacher praised her.
今天是我们家一个重大的日子，因为弟弟出生了。全家都很高兴。
jīn tiān shì wǒ men jiā yí gè zhòng dà de rì zi， yīn wèi dì di chū shēng le。 quán jiā dōu hěn gāo xìng。
Today is a major day for our family because my little brother was born. The whole family is very happy.
Mini dialogue
好消息
A
我有一个重大的消息。
Wǒ yǒu yī gè zhòngdà de xiāoxi.
I have a major piece of news.
B
什么重大消息？
Shénme zhòngdà xiāoxi?
What major news?
A
我们班要参加比赛了。
Wǒmen bān yào cānjiā bǐsài le.
Our class is going to participate in a competition.
节日
A
春节是中国重大的节日。
Chūnjié shì Zhōngguó zhòngdà de jiérì.
Spring Festival is a major holiday in China.
B
是的，大家都很开心。
Shì de, dàjiā dōu hěn kāixīn.
Yes, everyone is very happy.
Related words and contrasts
similar
重要
zhòngyào
important
重要 is the most common word for 'important'; 重大 is stronger, for major events or decisions.
related
巨大
jùdà
huge; enormous
巨大 describes physical size or magnitude; 重大 describes significance.
opposite
轻微
qīngwēi
slight; minor
轻微 is the opposite of 重大, meaning trivial or insignificant.