двойные

двойные

"Double" or "dual."

Here, the word 'двойные' modifies 'окна' (windows), indicating that they are double-layered, enhancing insulation and soundproofing.

Я купил двойные окна для моей квартиры.

I bought double windows for my apartment.

In this context, 'двойные' describes 'звездные системы' (star systems), illustrating the concept of two stars that are gravitationally bound.

На уроках физики мы изучали двойные звездные системы.

In physics class, we studied binary star systems.

Here, 'двойные' refers to 'порции еды' (portions of food), meaning portions that are twice the usual size to accommodate a picnic.

Не забудь взять двойные порции еды для пикника.

Don't forget to take double portions of food for the picnic.