Product bundle: A product bundle is itself a product (of the root product type).

产品包：产品包本身就是一种产品（使用根产品类型）。

youdao

So you take the square root of the product.

你应该用乘积的平方根。

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If you had one negative number in it, then the product would be a negative number and, if you took a root of that, then you might get an imaginary number.

如果这当中有一个负数,乘积就会变成负的,如果你对一个负数开根号,你就会得到一个虚数

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However we acknowledge that if the iPhone 5 fails to reveal new features that impress Apple followers as one WSJ article yesterday highlights, this could weigh on the stock as fears of product fatigue take root.

FORBES: Apple Stock Price Lives And Dies With iPhone