This is the 2466th most frequent Chinese word.
恒
Permanent; constant; enduring.
In this sentence, '恒星' specifically refers to 'star,' combining '恒,' signifying durability or constancy, with '星,' meaning star.
恒星是宇宙中发光的天体。
Stars are luminous celestial objects in the universe.
Here '恒久' describes something long-lasting or eternal, showing the meaning of '恒' as persistence and continuity.
他的努力是恒久不变的。
His efforts are everlasting and unwavering.
In this context, '恒心' means persistence or resolve, emphasizing '恒' as steadiness and consistency.