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.
其中应用题中含盖的范围有：计算方法、系统学、几何学、测量和使用加法和减法。
Areas covered include numeration, number systems, geometry, measurement, and the use of addition and subtraction in word problems.
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