The surface of the Earth or another surface that forms the base of something.

The plural form of nucleus, referring to the central part of an atom or a cell.

परमाणु का केंद्र

English Usage: The nuclei of the atoms are crucial for understanding chemistry.

Hindi Usage: परमाणुओं के केंद्र रसायन विज्ञान को समझने के लिए महत्वपूर्ण हैं.