That's because body text gets to break the consistency rule, especially if your heading fonts are serif fonts (serif fonts have the little squiggles, like at the end of the downstroke of the "y").
这是因为主体文本打破了一致性原则，尤其是当标题字体是serif字体的时候(serif字体有一些花体，比如字母“y”的最后一笔的末尾)。
The basic principles and simulation methods of a null-coupler-based OADM are studied firstly, especially in the crosstalk of a Y-branch structure and the coupling properties of a tilted grating.
论文首先研究了零耦合器型OADM器件的基本原理与设计方法，特别是Y分支的串扰特性与斜光栅的耦合特性。
The basic principles and simulation methods of a null-coupler-based OADM are studied firstly, especially in the crosstalk of a Y-branch structure and the coupling properties of a tilted grating.
论文首先研究了零耦合器型OADM器件的基本原理与设计方法，特别是Y分支的串扰特性与斜光栅的耦合特性。
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