Definition: to continue to be a secret/ mystery, etc. Level: B2
婚礼的具体日期仍然是个秘密。
The exact date of the wedding ___remains ___a ___secret.
宝藏的真正位置仍然是个谜。
The true location of the treasure ___remains ___a ___mystery.
他突然离开的原因仍然是个谜。
The reason for his sudden departure ___remained ___an ___enigma.
