Learn Arabic (Modern Standard): طرحت الباحثة إشكالية جديدة. - The female researcher presented a new issue.

While مشكلة is a general word for 'problem,' the term إشكالية is an academic or formal concept meaning 'problematic,' 'dilemma,' or a complex theoretical issue. Because the subject is a باحثة (researcher), this academic term is the most natural choice.

The verb طرحت is related to the root for 'throwing'. Why does it mean 'presented' in this context?

The root ط ر ح does literally mean 'to throw' or 'to cast.' However, in intellectual and academic contexts, it is the standard verb used to mean 'to pose (a question)' or 'to raise/present (an issue).' You can think of it as throwing an idea onto the table for discussion.

How would we rewrite this to use the lesson's formal existential adverb ثمة to say 'There is a new issue that the researcher presented'?

You would start with the adverb and the indefinite noun, followed by a relative clause: ثمة إشكالية جديدة طرحتها الباحثة. Notice that in the Arabic relative clause, we must attach the object pronoun ها to the verb so it refers back to the issue.

If reading this sentence aloud with full vowel endings, how is the transition between طرحت and الباحثة pronounced?

It is pronounced طرحتِ الباحثة (taraHati-l-baahitha). The feminine marker 'taa' on the verb is naturally vowelless (sukoon), but to avoid a cluster of two unvoweled consonants when connecting to the definite article, we add a helper vowel 'kasra' (i) to the 'taa'.