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1·He cuts a piece forming a circular sector of 60 degrees and flips the piece upside down, with the icing on the bottom.

他先切下一块圆心角60度的扇形，把这块颠倒过来，糖衣放在下面。

2·The finite method of EHLwas used to analyze the properties of sector pad and circular pad thrust bearing separately on the condition of centre pivoted.

应用有限元程序分别对圆形瓦和扇形瓦推力轴承在中心支承条件下的性能进行了计算。

3·Case description: Zero Waste Scotland introduced the concept of the circular economy to the Scottish textiles sector at events throughout 2013 to 2014.

案例描述：在2013年到2014年中，“零浪费”的循环经济概念被引入到了苏格兰纺织品行业的事件。

4·The gear sector of variable transmission ratio in automobile steering mechanism is a variable module non-circular gear.

变传动比汽车转向器齿扇是变模数的非圆齿轮。