sholes

Of course , Sholes claimed that the new arrangement was scientific and would add speed and efficiency .

肖尔斯自然声称，新的排列是科学的，能够提高速度和效率。

But Sholes had a problem .

但是肖尔斯碰到一个问题。

The first practical typewriter was patented in the United States in1868 by Christopher Latham Sholes .

1868年克里斯托弗·莱瑟姆·肖尔斯在美国为第一台实用的打字机申请专利。

Sholes didn 't know how to keep the keys from sticking , so his solution was to keep the typist from typing too fast .

肖尔斯想不出如何使各键互不干扰，他的解决办法就是让打字员别打太快。

The paper analyses three main theories : Markowitz 's portfolio Selection Model , Sharpe 's Capital Asset Pricing Model , Black and Sholes ' Option Pricing Model . Besides , the paper also studies Duration-Convexity theory .

本文系统分析关于证券投资市场风险计量的三个核心理论：马科维茨投资组合理论、资本资产定价模型、期权定价理论。