The explanation is that each aspen while appearing to exist separately as a single tree, is in fact only the stem or shoot of a far larger organism.

对此的解释是，每一棵白杨，虽然看起来是独立存在的一棵树，但实际上只是一个巨型有机体的茎或芽。

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Many of Mr Obama's mistakes stem from a single strategic miscalculation: he is trying to do too much too quickly.

奥巴马的许多错误产生于一个简单的战略错判：他太急于求成了。

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The ACT team also froze the embryos and used the single cell that was removed as a source of human embryonic stem cells.

ACT小组也将实验中的这些胚胎组织冻存，使用分离的单细胞作为人类胚胎干细胞的来源。

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The women wore white, symbolising pure intentions, and carried gladioli, a single stem each.

ECONOMIST: Laura Poll��n

But the real problem behind employees' insecure practices, says Trend Micro's Perry, doesn't stem from any single trend.

FORBES: Accounting For Human Error

He is working with Quake to create a thumb-size chip that can automatically catalog the genes and proteins inside a single stem cell.

FORBES: Magazine Article