Each fibre/fiber has a hollow core.
nuclear reactor cores
This is seen as the central core of the government's policy.
A new spirit welled up from the very core of the nation.
a common core of shared understanding
A hard core of supporters gathered to see the star arrive.
hard-core party members
the emotional core of her music
These ideas formed the core of his philosophy.
We want to get to the core of the problem.
At the core of our convictions is belief in individual liberty.
She was shaken to the core by the news.
He's a politician to the core (= in all his attitudes, beliefs and actions).
heat from the earth's core
no core — без отбора керна, с нулевым отбором керна;
to contaminate a core — загрязнять керн;
to cut a core — выбуривать керн;
to extract a core — извлекать керн ([i]/i]);
to foul a core — загрязнять керн;
to retain a core — отбирать керн;
to take a core — поднимать керн; получать керн;
to withdraw a core — извлекать керн