打预防针

děng nǐ yǒu le qiān zhèng nǐ yě děi dǎ yù fáng zhēn cái néng dé dào huáng pí shū

等你有了签证，你也得打预防针才能得到黄皮书。

You will have to be inoculated for the yellow paper when you've got the visa.

wǒ shuō de zhè xiē jiù dāng gěi nǐ dǎ yù fáng zhēn ba

我说的这些就当给你打预防针吧。

Let these words of mine serve as a warning to you.

hái zi men jiāng qù yī yuàn dǎ yù fáng zhēn

孩子们将去医院打预防针。

The children are going to the hospital to be inoculated.