Meaning of jì:
寄
to send; to mail; to entrust; to depend on; to attach oneself to; to live (in a house); to lodge; foster (son etc)
Wǒ dǎsuàn jīntiān xiàwǔ qù yóujú jì xìn.
我打算今天下午去邮局寄信。
I plan to go to the post office to send a letter this afternoon.
Wǒ jīntiān qù yóujú jì le yī fēng xìn.
我今天去邮局寄了一封信。
I went to the post office to mail a letter today.
Tā juédìng bǎ xìn jiāogěi yóujú qù jì.
她决定把信交给邮局去寄。
She decided to entrust the letter to the post office for delivery.
Tā jīngcháng gěi péngyǒu jì míngxìnpiàn.
她经常给朋友寄明信片。
She often sends postcards to her friends.
Tā bǎ xìn jì chū le.
他把信寄出了。
He sent out the letter.
Tā zài péngyǒu jiālǐ jì zhùle jǐ tiān.
他在朋友家里寄住了几天。
He lived at his friend's house for a few days.
Wǒ xiǎng jì bāoguǒ gěi péngyǒu.
我想寄包裹给朋友。
I want to send a package to my friend.
Tā shì wǒmen de jìzǐ.
他是我们的寄子。
He is our foster son.