Arched bridge of Nielsen system structure is very complicated, and a lot of factors affect its stability.

尼尔森体系拱桥本身结构复杂，影响其稳定性的因素很多。

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"Experience tells us such a system is almost impossible to predict," Nielsen said.

“经验告诉我们，这样的一个系统基本上是不可能预测的。”尼尔森说道。

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To get the age estimates, Nielsen and his team used a complex system that combines chemical tests, mathematical models and growth measurements.

为了估算年龄，尼尔森及其小组采用了一种结合化学试验、数学模型和生长测量的复杂系统。

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The Nielsen rating system, used to charge for ads and to determine which shows live and die, will be under pressure.

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Who's Your Daddy, the first episode of which was shown on 3 January, pulled in a disappointing audience of 6.3 million, according to the Nielsen ratings system.

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Few advertisers want to rely entirely on traditional research, particularly America's Nielsen television-ratings system.

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