The ancestors of plants were photosynthetic single-celled organisms that gave rise to plants presumably lacked true roots, stems, leaves, and complex reproductive structures such as flowers.
植物的祖先是进行光合作用的单细胞生物，由此产生的植物可能缺乏真正的根、茎、叶和复杂的生殖结构，如花朵。
Drake's debut album, Five Leaves Left, was a remarkable work: stuffed with complex, introspective music but leavened with arrangements and production straight off the pop shelf.
德雷克的首张专辑《剩下五根烟》是一张杰作：专辑中充满了复杂内省的音乐，但编曲和制作直接将这张唱片置于流行音乐货架之外。
This leaves open the possibility that the complex debris tail is the result of an impact between two bodies, rather than ice simply melting from a parent body.
种种迹象都指出这构成复杂的星体残骸源于两个星体的撞击，而非从寻常母体星球上脱落的融化冰块。
The microRNA, miR164, has been implicated in aging in Arabidopsis and was part of a complex genetic chain that changed as leaves aged.
其中MIR164这个微RNA，在Arabidopsis的衰老进程中被确认是一个复杂遗传链条的部分，那链条随着树叶的衰老而变化。
Thus, it can deal with more complex background scenes, such as waving leaves and flapping flags.
因此，它可能应付更加复杂的背景场面，例如挥动的叶子和拍动旗子。
Your list of bullet point characteristics and goals arrived at in Step 4 points to the essence of complex behaviors, but leaves much implied.
在第4步中，你所列出的关键特征要点和目标指出了复杂行为的本质，但留下了更多有待澄清的问题。
"We take Aloe vera leaves and put them through a series of complex extraction steps to produce a chemically pure powder, and then we combine the flu vaccine with it, " he explains.
我们采用芦荟叶，通过一系列复杂的提取步序得到一种化学纯粉末，然后将流感病毒疫苗与之混合。
For the complex biochemical system of extracted liquid of tea leaves, ANDEUF-01 ultrafiltration pilot unit is used to refine it.
针对茶叶水提取液这一复杂的生物体系，本研究采用ANDEUF-01超滤中试机对提取液进行精制。
When the new president, Andrew Hamilton, leaves his post at Oxford University to join N. Y. U. in January, he will be walking into a set of complex challenges.
新任校长安德鲁·汉密尔顿（Andrew Hamilton）将于明年1月份从牛津大学离职，加入纽约大学的领导队伍，届时他将会面对一系列复杂的挑战。
When the new president, Andrew Hamilton, leaves his post at Oxford University to join N. Y. U. in January, he will be walking into a set of complex challenges.
新任校长安德鲁·汉密尔顿（Andrew Hamilton）将于明年1月份从牛津大学离职，加入纽约大学的领导队伍，届时他将会面对一系列复杂的挑战。
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