The 21-year-old model risks damaged internal organs in her bid to achieve what she believes is the perfect hourglass figure.
为了实现她认为的完美的沙漏身材，这位21岁的模特冒着损害内脏器官的风险。
In this paper a new grinding method, using small cylindrical face grinding wheel to grind straight outline hourglass worm, is put forward and the mathematical model is set up.
本文提出了用小圆柱面砂轮磨削直廓环面蜗杆的新方法，建立了数学模型。
In this paper a new grinding method, using small cylindrical face grinding wheel to grind straight outline hourglass worm, is put forward and the mathematical model is set up.
本文提出了用小圆柱面砂轮磨削直廓环面蜗杆的新方法，建立了数学模型。
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