remain = to continue to be in the same state or condition
翻译：
中秋节一直是中国人最喜欢庆祝的节日之一。
The Mid-Autumn Festival remains one of the festivals that the Chinese enjoy celebrating the most.
造句：
Though seventeen years has passed, the September 11 attacks remain vivid in the memories of many Americans.
虽然 17 年过去了，911 事件仍然让很多美国人记忆犹新。
Whoever killed him remains unknown.
究竟是谁杀的他仍然不得而知。
