How do you translate know what are into Chinese?

"Know what are" is not a grammatically correct phrase in English. It's likely you're trying to express a question like:

* "What are they?"

* "What are these?"

* "What are those?"

Here are the translations of these phrases into Chinese:

* "What are they?" - 他们是什么？ (Tāmen shì shénme?)

* "What are these?" - 这些是什么？ (Zhèxiē shì shénme?)

* "What are those?" - 那些是什么？ (Nàxiē shì shénme?)

Please provide more context or the full sentence you're trying to translate so I can give you the most accurate translation.