今天写的是说明文，难点不在于构思内容甚至词句，而在于组织筛选信息。什么是重要的点，介绍各点的顺序又该是什么。
Background material :http://homeguides.sfgate.com/oak-trees-bloom-66716.html
Annie思路：由总体印象谈起，再从四季循环开始细节描述。春季的生长(光合作用、糖分吸收、根部生长、养分运输、雌雄花的介绍)，夏季生长过程加快，秋冬季节的萧条，而后是周而复始的循环。主线脉络就是季节，中间插入部分生物知识，整体连贯衔接得当。
Jo思路：从橡树的宏观生长过程谈起，单独聊橡果和传粉。虽然不像安的文章一样整体更为紧凑，但算独辟蹊径，令人耳目一新。
精彩语句摘抄如下：In a span of 20 years or so, it soars up challenging the clouds and lasts for around 600 years.
They appear in spring when temperature startsto go up, prosper in summer with sufficient sun light and humidity, turn into autumn colors as they stop photosynthesizing and fall away in winter, putting the tree in dormancy and setting the stage for the next such cycle.
本文没有作过多思考或功课，只是四处拼凑加paraphrase完工，懒惰做法，警戒警戒！
Undisputedly, the oak tree is the king of theWestern world.Majestic and towering, oak trees featurea large canopy top and a straight trunk growing upward. In spring, new leaves sprout,signaling the onset of the cycle of growth. Through photosynthesis, oak trees obtainthe energy needed for growing. In this process, carbon dioxide and sunlightabsorbed by chlorophyll in the leaves are converted to organic matter, which isthen passed down via the phloem in the trunk to nourish the whole tree. In addition,water and minerals are absorbed from the soil by its deep and broad root systemand then get transported up by the xylem to the leaves, where water is used asan essential input for successful photosynthesis.
Oak trees self-pollinate, in other words,they produce both male and female flowers. Nestled against the base of twigs, thefemale flowers are hard to see and look much like tiny leaf buds, hence being ratherlow-profile. By contrast, the male flowers hang in showy, long andyellowish-green clusters. The seeds – acorns will take one to two years before droppingfrom the tree.
When summer comes, stronger sunlightstimulate the photosynthesis process, along with more rapid hydraulic cycles inhot temperatures. The tree increases in height, its trunk grows thicker andgreener leaves thrive. As fall sets in, the leaves put on more red and orangecolor. Winter will see the whole tree falls asleep with bare branches, waitingfor life to rejuvenate in the next spring. Under optimal conditions, the oaktree can grow as high as 130 feet and last for 600 years.
Bud同义词：shoot (up)、sprout；Blossom, bloom特指花；
Fuel同义词：feed, intensify, stimulate, provoke,whip up
