Among those P&G brands are products many American consumers use everyday, like toothpaste,deodorant, disposable baby diapers, laundry detergent and potato chips.

VOA: standard.2010.02.20

Again, so as we don't get confused, normally we use S for strategy, but let's use P since they're prices.

为了避免混淆,通常我们用S表示策略,但是这次我们使用P,因为它代表价格

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v We don't know what it is yet. In order to change this from a p to a V, you have to use the chain rule. So let's use the chain rule.

为了把这里的p变成,我们需要利用链式法则,好，让我们使用链式法则。

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