硅在半导体元件要单结晶：它需要有一个非常纯净的晶体形式，如果没有缺陷的晶体结构。
The silicon in semiconductor components has to be mono crystalline: it has to have a very pure crystal form without defects in the crystal structure.
在拉速提高的条件下，必须优化结晶器内流场以适应稳定生产的需要，防止气孔、拉漏等铸坯缺陷的产生。
Fluid flow in the mould must be optimized in order to improve the internal and surface quality of the slabs while increasing the casting speed.
结晶器铜管在引仲加工过程中，由于凹模中心线与机床运动方向轨迹线不同，造成加工干涉和产品缺陷。
In the course of drawing process, the process interference and defect take place because of the difference between the centerline of concave die and the trace of moving direction.
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