当周期物体的单胞空间频率交叉项比主频率项小到可忽略的程度时，角度限制失效。
If the cross terms of the spatial frequencies for the unit cell of periodical object are much smaller than the main frequency terms, the restriction of the Angle is not necessary.
具有角度限制的电子束投影曝光技术有可能成为21世纪最有潜力的纳米光刻技术之一。
The projection electron beam lithography with angular limitation(PEBL)is potentially one of the most attractive techniques for nano lithography in the21st Century.
从重定义构造限制的角度来看，这些模式构造在模式设计中常常很有用。
The use of these schema constructs, in light of redefine construct restrictions, is often very useful in schema design.
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