How are foreign exchange rates expressed? In the forex market, they're displayed with the US dollar at the center.
Literal
Foreign-exchange rate [topic-って] how express [question-の]? Foreign-exchange market [at-では], US-dollar [object-を] center [to-に] displayed.
A Q&A format common in educational materials. The question uses casual って (topic marker) and の (question particle), while the answer shifts to polite passive 表示されます. 外国為替 ('foreign exchange') is a formal financial term. 米ドル uses 米 for America, from the old ateji 亜米利加.