连墙杆必须采用可承受拉力和压力的构造。
Even the wall rod structure can sustain tension and pressure must be used.
如果用拉力和压力重复地交替加载金属，金属强度就会减少。
P96 the strength of metals is reduced if they are repeatedly loaded alternately in tension and in compression.
后来的几十年里，压力和拉力逐渐积累。
Over the decades, the stresses and strains gradually built up.
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