炸圈饼面团一种未发涨的油炸面团圈，通常成纽绞条状，但也有圆环或长方形的。
An un raised doughnut usually twisted but also shaped into rings or oblongs.
轴承套圈余热退火辊底炉生产线是一高度机械化自动化的特大型加热设备。由于受厂房长度限制，设计成长方形的闭环结构，这是本设计的特点之一。
The large roller hearth furnace production line for annealing hot bearing RACES is designed as a rectangular and closed structure under the limit of the length of available shop.
取长方形纸带一条，扭曲一次，然后使两端相连进行粘合，所得到的曲面称为麦比乌斯圈。
If you twist a quadrate strip and then join both ends, you will get a curving surface named Mobius Circle.
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