Scientists have got to the root of grey hair – paving the way for locks that retain the lustre of their youth well into old age.

科学家已经找到头发变白的根源----这一发现将为人们一直到老都可保持青春的发色而铺平道路。

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The XML Document Object Model (DOM) defines several types of Nodes, including Elements (such as files or age), Attributes (such as units), and text (such as root or 10).

XML文档对象模型(DOM)定义了几种不同的nodes类型，包括Elements(如files或者age)、Attributes(如units)和Text(如root或者10)。

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The higher oil yield and better quality could be obtained with the root age of 20-24 months.

从根龄20—24个月的香根得到的精油产量最高，质量最好。

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