The pen is placed at any point on the rolling circle.
笔可以放在这个滚动的圆形的任何一个点上。
High-strength precision rolling Ballpoint pen Tsui, fluent writing.
高强度精密滚动走珠笔咀，能流畅的书写。
The industry hopes to resurrect the market by rolling out next-generation versions of stents, metal-mesh tubes about the size of an ink pen spring that unfold inside coronary arteries like a scaffold.
这种支架由金属网制成，管状，和水笔中的弹簧差不多大小，可以在冠状动脉内像支架一样展开。
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