关于中国经济，外媒抛出的这些谬论必须澄清

关于 is a preposition used to introduce the topic of a statement, meaning 'about', 'regarding', or 'concerning'. It usually appears at the beginning of a sentence or phrase to set the subject matter.

A verb phrase can modify a noun by adding 的 before the noun. Here, 外媒抛出的 modifies 这些谬论, meaning 'the fallacies put forward by foreign media'. This is a very common Chinese relative clause pattern.

这些 is a demonstrative phrase meaning 'these'. It is used before a noun to point out specific plural things close in context or already known to the listener or reader.

必须 expresses strong necessity or obligation, similar to 'must' or 'have to' in English. It is placed before a verb to show that an action is necessary.

This sentence pattern states that something must be done. In the text, 这些谬论 is the subject, 必须 shows necessity, and 澄清 is the action, giving the meaning 'these fallacies must be clarified'.