通过用漂浮的PP球更换标准球，重力球形止回阀可以改造为适用于空气或气体排气口。
Gravity ball check may be converted for air or gas venting by replacement of standard ball with floater PP ball.
介绍了一种数字铅球，它的质量与外形尺寸均与标准比赛用球一致，能够实时感知铅球运动员在投掷过程中人手施加于铅球的三维力信息。
A digital shot sensor to measure shot-put force in time is introduced, which has the same mass and external dimensions with the normal shot put.
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