Targeted at one of the stock index derivative instruments-stock index option, this paper does some research work to elaborate the significance of developing it in China.

本文以股指类衍生金融工具的一种——股票指数期权为研究对象，侧重于用数量方法来阐述其在我国开发应用的意义。

youdao

Still, given the recent deaths, the MTA is being urged to try a more elaborate and expensive option: glass safety barriers.

WSJ: NYC subway safety options discussed