三岁

hái zi yào dào sān suì cái huì zhǎng qí èr shí kē rǔ yá

孩子要到三岁才会长齐二十颗乳牙。

Children don't complete their set of 20 baby teeth until they are three years old.

tā sān suì shí wǒ men bān dào le měi guó

他三岁时，我们搬到了美国。

We moved to America when he was three.