本雅明《巴黎拱廊街》:一个句子..翻译

在液压升降机构的设计与计算过程中，首先根据上桁架的整个工作过程，确立了液压原理图，再根据桁架的载重情况，建立举升力曲线图。

液压升降机hydraulic elevator
桁架truss
液压hydraulic pressure

in the design and calculation procedure of hydraulic elevator, a principal graph of hydraulic pressure should be established fist according to the whole working process of the upper truss.then establish the lifting force graph according to the carrying capacity of the truss.

In the hydraulic pressure elevating mechanism design and the computation process, first acts according to on the truss entire work process, has established the hydraulic pressure schematic diagram, again acts according to the truss the carrying capacity situation, the establishment lifts the lifting force diagram of curves

While the hydraulic pressure hoists or lower design and calculation of the organization, according to having the whole working course of the truss at first, establish hydraulic principle picture, and then according to load situation of truss, set up and put up the curve graph of lift.