计算是相对地直接的，但他们必须能应付以所有可以想像的几何学情况，包括垂直线，平行的线，等等。
The computations are relatively straightforward, but they must be able to cope with all conceivable geometric situations, including vertical lines, parallel lines, and so on.
当桁架很大时，根据几何学定律来计算相对位移就会变成很麻烦的事。
When the truss is large such a calculation of a relative displacement by the laws of geometry becomes excessively tedious.
本文讨论以相对论速度抛射的相对论膨胀等离子团的一些几何学和运动学性质。
In this paper some geometric and kinematic features of a plasmon which is expanding and ejected both relativistically are discussed.
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