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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CML starts with a change to a single stem cell. A stem cell is a type of cell found in marrow that makes red cells, white cells and platelets.

慢粒的发病源于单个干细胞的变异。干细胞存在于骨髓中，可以分化成红细胞、白细胞和血小板。

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The haematopoietic stem cell transplant unit, with 10 single en-suite rooms, has been built in the hospital's former Bracken ward.

BBC: Derriford Hospital's ?3m stem cell isolation unit praised

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

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