平面上的直线束是指平面上通过一个固定点的所有直线的集合,此时固定点叫做束的中心,这个束本身叫做真的;也指平面上平行于一条已知直线的所有直线的集合,此时,我们说束的中心“落在无穷远处”,而这个束叫做假的。
本文给出了空间直线束的概念,并给出了空间直线束的两种形式。
In this paper we give the definition of the family of lines in space and its forms of equations.
该裂变过程会利用直线加速器质子束产生的中子加以控制。
The fission process would be controlled using neutrons produced by a linear accelerator's proton beam.
是成束的裆下的模式,但只要你在一条直线上削减这种优势也不要紧,因为最终仍会有弹性。
The crotch is bunched up under the pattern, but as long as you cut that edge in a straight line it doesn't matter because there will eventually be elastic there.
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