由重'磅(7.2千克)的金属球和一条长链或木把手组成，人手持链端或把手在田径比赛中将其投远以争高低。
Sports a metal ball weighing 'pounds (7.2 kilograms) and having a long wire or wooden handle by which it is thrown for distance in track-and-field competition.
链球由重16磅(7。2千克)的金属球和一条长链或木把手组成，人手持链端或把手在田径比赛中将其投远以争高低。
A metal ball weighing16 pounds (7. 2 kilograms) and having a long wire or wooden handle by which it is thrown for distance in track - and - field competition.
然而体积大重量重是背投系统致命的弱点，系统厚度和质量也是衡量背投系统实用性的重要指标。
Whereas, the large volume and heavy weight are fetal to the system, which are crucial factors to evaluate it.
然而体积大重量重是背投系统致命的弱点，系统厚度和质量也是衡量背投系统实用性的重要指标。
Whereas, the large volume and heavy weight are fetal to the system, which are crucial factors to evaluate it.
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