以下为句子列表：
英文: At the end of February, the bract attained approximately their full size, and a pair of anatropous ovules were initiated on the adaxial surface at the base of the fertile ovuliferous scale.
中文: 2月底，苞片体积不再发生变化，珠鳞膨大端的基部的近轴面分化出2个倒生胚珠。
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英文: In the early December, the first bract primordium was formed in the axil scale at the cone base, then bract initiation had occurred in acropetal direction.
中文: 12月初，最初的苞片原基在雌球果原基的鳞片的叶腋处产生，之后其由基部向顶部连续发生。
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英文: The determination of photosynthetic physiological parameters of bract of Areceae spadix during growing period showed that it contained photosynthetic pigment and, was capable of photosynthesis, transpiration, although lower than those of leaves.
中文: 本研究同时对天南星的苞叶进行全生育期光合生理指标的测定，发现其中含有一定量的光合色素，能够进行较低的光合作用，同时其水分利用效率也很低；
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英文: The results showed that the flower bud differentiation process lasted for about months from bract primordia differentiation in mid April to carpel primordia formation in late August.
中文: 研究表明 :厚瓣金桂花芽分化从 月中旬开始分化苞片原基至 8月底心皮原基形成历时约 个月 ,其过程可分为苞片分化期、花序原基分化期、花蕾原基分化期、顶花花萼分化期、花瓣分化期、雄蕊分化期和雌蕊分化期 7个时期。
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英文: Cloning and Analyzing of Bract Differentially Expressed Genes of Davidia Involucrata Baill
中文: 珍稀濒危植物珙桐（Davidia involucrata）苞片差异表达基因的克隆与分析
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