我要去买学画画需要的材料。

Wǒ yào qù mǎi xué huàhuà xūyào de cáiliào.

I am going to buy materials needed to learn to paint.

煮这道菜需要什么材料？

Zhǔ zhè dào cài xūyào shénme cáiliào?

What ingredients do we need to make this dish?

那批材料在运送过程中遇到困难了。

Nà pī cáiliào zài yùnsòng guòchéng zhōng yùdào kùnnan le.

That batch of materials encountered difficulties during transportation.