This is the 9973rd most frequent Russian word.
аннотации
Annotations, summaries, or explanatory notes.
In this sentence, 'аннотации' refers to brief summaries or explanatory notes accompanying the book.
Учитель попросил студентов внимательно прочитать аннотации к книге.
The teacher asked the students to carefully read the annotations to the book.
Here, 'аннотации' means academic summaries or explanatory descriptions of research studies.
Для научной работы важно уметь составлять аннотации к исследованиям.
For scientific work, it is important to be able to draft annotations for studies.
In this usage, 'аннотации' implies additional explanatory notes enhancing comprehension of the materials.