A group of kids started a pickup game of basketball on the street outside.

一群孩子在外面开始了即兴街头篮球赛。

《牛津词典》

You may have certain very close friends you rely on for deeply personal conversations, and more casual friendships for movies, a pickup game of basketball or backyard cookouts.

你可以有一些非常亲密的朋友，可以与他们进行非常个人化的交谈，以及一些可以一起看电影、打篮球、聚餐的休闲朋友。

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Little kids are playing a pickup game of soccer, using a 10th of the field.

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She and her fellow soccer teammates also played a marathon pickup game to raise money for breast cancer research.

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Middle-class kids are far more likely to play a pickup game of basketball or baseball than pick up a racket.

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