ball jacks
球千斤顶
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mr. Workman was known for having a whimsical streak, packaging books with toys such as jacks and marbles, a soccer manual that included a ball and a karate manual with a white belt.
WSJ: Workman Founder Sold Quirky Books
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