The strike price of an option times the number of underlying securities in the contract.

选择权合约交易的数量与单位履约价格的乘积；

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Customer may not withdraw the deposited underlying securities without the consent of Company.

未经乙方同意前，甲方不得自行领回缴交之标的证券。

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Of course, the company is not going to have to make good on all that insurance: the underlying securities are not all going to zero.

当然，它是不会需要赔偿所有这种保险：因为不是所有相关证券都会贬值为零的。

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The opposite trade occurs when ETF shares trade at a discount to their underlying securities.

FORBES: Why We Don't Buy Corporate Bond ETFs

In the options world, contract prices are directly related to the volatility of the underlying securities.

WSJ: Upside: Options for Nervous Investors

Schaeffer is an options guy, but the technical indicators he monitors are useful for determining trends in underlying securities, as well.

FORBES: Bernie Schaeffer: Tech And Gold Harmony