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The tennis ball-style single stack of balls in a tight-fitting cylinder is the simplest;
网球式的单层包装将圆柱体塞满是最简单的；
youdao
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The stack is fitting -up on the simple support.
设备组对放在简易的支撑上。
youdao
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The stack is fitting -up on the simple support.
设备组对放在简易的支撑上。
youdao