On the 27th day of the experiment, the researchers measured stem length, root-system length and the overall weight of the plants.

实验第27天，研究者测量了茎的长度，根系长度以及植物总重量。

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It spreads primarily by underground stems; colonies form when pieces of the root system or whole plants float into an area and take root or when seeds float into a suitable area and germinate.

它主要通过地下茎传播；当根系统碎片或整个植物漂浮到一个区域并生根，或当种子漂浮到一个合适的区域并发芽时，菌落就形成了。

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A group of thousands of aspens can actually constitute a single organism, called a clone, that shares an interconnected root system and a unique set of genes.

一群成千上万的白杨实际上可以组成一个单独的有机体，被称为克隆，它们共享一个相互连接的根系和一套独特的基因。

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Specifically, ICANN is responsible for coordinating the assignment of protocol parameters, overseeing the domain name system, allocating IP-address space and managing the root-server system.

CNN: 15 new firms approved to sell Net addresses

Meanwhile, the Dodd-Frank approach does nothing to address the most obvious root causes of damage to the financial system--conflict of interest due to the issuer-pays model and staleness of ratings.

FORBES

South Africa is one of just a few countries in the world that that has a court system that takes root in Roman-Dutch law.

NPR: A Look At South Africa's Justice System