How do you write cereal in mandarin?

There are actually two ways to write "cereal" in Mandarin, depending on the context:

1. 谷物 (gǔ wù): This literally means "grain" and is the most common way to refer to cereal in general. It's often used to describe the type of grain used to make the cereal, such as "米谷 (mǐ gǔ)" for rice cereal.

2. 麦片 (mài piàn): This literally means "wheat flakes" and is more specific to breakfast cereal, especially the kind made with wheat.

So, depending on the context, you can use either "谷物" or "麦片" to express "cereal" in Mandarin.