Simplify the following text for a Grade 12 native English-speaking person.
Original: This study can be limited to one language or can cover more than one language at the same time ( multilingual terminology , bilingual terminology , and so forth ) or may focus on studies of terms used in teaching across different fields .
Simplified: This study can be limited to one language or can cover more than one language at the same time ( multilingual terminology , bilingual terminology , and so forth ) or may focus on studies of terms across fields .