marble
noun uk/ˈmɑː.bəl/ us/ˈmɑːr.bəl/
(ROCK)
[ U ]大理石
a type of very hard rock that has a pattern of lines going through it, feels cold, and can be polished to become smooth and shiny
a marble floor/statue 大理石地面／雕像
(GLASS BALL)
[ C ]（儿童游戏中用的）弹子
a small ball, usually made of coloured or transparent glass, that is used in children's games
marbles [ U ] 弹子游戏
a children's game in which small, round glass balls are rolled along the floor
We played marbles in the courtyard.
They passed the weeks playing long games of marbles.
Laurence always beat his friends at marbles.
Shall we have a game of marbles in the hall?
There's nothing to do here except for marbles and chess.
Idiom
your marblesidiom informal humorous精神健康；思考和记忆能力
your mental health or your ability to think and remember clearly
I think he's losing his marbles (= starting to forget things or become crazy). 我认为他脑子开始出问题了。
She's 89, but she's still got all her marbles. 她已89岁，但头脑非常清楚。