探讨了剪力键的类型、试验承载力、以及其弹性和塑性设计方法。
The paper discusses shear key's species, test of bearing capacity and elastic theory and plastic theory.
第四部分，以个股为研究对象，随机抽取了20支股票，分别进行了股票价格弹性和塑性性质的研究。
Fourthly, making the single stock as our research object, the author selects 20 stock samples at random, then carries on the research respectively on elasticity and elasticity of the stock.
那一年，查尔斯·固特异偶然把橡胶和硫磺滴到热炉子上，引起橡胶象皮革一样焦化但依然保持良好的可塑性和弹性。
In that year, Charles Goodyear accidentally dropped rubber and sulfur on a hot stovetop, causing it to char like leather yet remain plastic and elastic.
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