The technology in bowling balls is crazy and it changes very often as there are limited, very limited, specifications that ball manufacturers must follow.
由于厂商在制球时所须遵守的规格限制很少，使球的设计更新的非常快速。
The technology in bowling balls is crazy and it changes very often as there are limited, very limited, specifications that ball manufacturers must follow.
由于厂商在制球时所须遵守的规格限制很少，使球的设计更新的非常快速。
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