That the world went through two world wars in a short span of 30 years in the first half of the 20th century left mankind with unprecedented carnage and painful lessons.
在20世纪上半叶，不到30年就爆发了两次世界大战，给人类带来空前的浩劫和惨痛的教训。
The practice proves that it needs to be further discussed that the flexible suspenders of a large-span half through bridge are designed as axial tension members.
实践证明，大跨中承式拱桥柔性吊杆按照轴心受拉杆件进行设计的方法有待商榷。
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