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Let’s play a game that uses marbles.
In America, there is a contest every January where French people who are good at marbles gather.
He gave me a single marble as proof of our marriage.
Presumably this ビー is short for the word "bead." Beads used to be glass, which means that if you have a glass bead ball, you probably have yourself a marble.
If you know katakana as well as the reading that you learned when you learned the kanji 玉, you should be able to read this. Just watch out for the rendaku.