Usage note
千万可以表示数量很大，也表示一定要。
qiān wàn kě yǐ biǎo shì shù liàng hěn dà， yě biǎo shì yí dìng yào。
Ten million can mean a very large amount, and it can also mean must.
Context note
千万常出现在提醒和强调里。
qiān wàn cháng chū xiàn zài tí xǐng hé qiáng diào lǐ。
Million often appears in reminders and emphasis.
5 examples
千万别忘。
qiān wàn bié wàng。
Be sure not to forget.
千万小心。
qiān wàn xiǎo xīn。
Be sure to be careful.
这个数字有千万。
zhè ge shù zì yǒu qiān wàn。
This number has millions.
千万要来。
qiān wàn yào lái。
You must come.
千万不要乱跑。
qiān wàn bú yào luàn pǎo。
Be sure not to run around.
5 mini stories
老师说下雨天千万要小心走路。
lǎo shī shuō xià yǔ tiān qiān wàn yào xiǎo xīn zǒu lù。
The teacher said on rainy days you must walk carefully.
妈妈提醒我千万别忘记带书包。
mā ma tí xǐng wǒ qiān wàn bié wàng jì dài shū bāo。
Mom reminded me not to forget my school bag.
这件事很重要，千万要记住。
zhè jiàn shì hěn zhòng yào， qiān wàn yào jì zhù。
This matter is very important; be sure to remember it.
他一再说千万不要迟到。
tā yí zài shuō qiān wàn bú yào chí dào。
He repeatedly said not to be late.
千万这个词常常用来提醒别人。
qiān wàn zhè ge cí cháng cháng yòng lái tí xǐng bié rén。
The word "千万" is often used to remind others.
Mini dialogue
过马路
A
过马路时千万要小心。
Guò mǎlù shí qiān wàn yào xiǎoxīn.
Be sure to be careful when crossing the road.
B
好的，我记住了，千万要看红绿灯。
Hǎo de, wǒ jìzhù le, qiān wàn yào kàn hónglǜdēng.
Okay, I remember, be sure to watch the traffic lights.
提醒朋友
A
明天有考试，你千万别迟到。
Míngtiān yǒu kǎoshì, nǐ qiān wàn bié chídào.
There's an exam tomorrow, be sure not to be late.
B
放心吧，我千万会早起的。
Fàngxīn ba, wǒ qiān wàn huì zǎoqǐ de.
Don't worry, I will definitely get up early.
Related words and contrasts
similar
一定
yī dìng
must; definitely
一定 is also used to urge someone strongly
similar
务必
wù bì
must; be sure to
务必 is more formal than 千万
related
绝对
jué duì
absolutely
千万 is often used with 不 to mean 'absolutely do not'