The processes of photosynthesis,by which carbon dioxide and

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The processes of photosynthesis,by which carbon dioxide and water are combined --in
the presence of chlorophyll and with energy derived from
light-- to form sugars,
require that carbon dioxide from the air enter the plant.
【简析】主谓之间被一个很长的定语从句 by which…隔开.该定语从句（黑体部分）是对主语 The processes（光合作用过程）的解释.
【译文】在有叶绿素和光能的情况下,二氧化碳和水通过光合作用结合形成单糖.这就
要求空气中的二氧化碳必须进入植物.
--in the presence of chlorophyll and with energy derived from light-- 这个短语里的with是怎么来的,看不懂,前面又有and了.
in the presence of 修饰的是chlorophyll 还是chlorophyll and with energy derived from light

with引导的状语从句.
伴随状语从句:用with引导的话,表示在进行一项动作的同时在进行另外一个动作,后面用名词+介词短语,或者直接用动词ing形式.如:The teacher came into the classroom,with books under her arm.She came here,with running.
in the presence of 在某人（某物）在场的情况下.in the presence of chlorophyll 在叶绿素的作用下

The processes of photosynthesis,by which carbon dioxide and what is the capacity of carbon dioxide? the amount of carbon dioxide in the atmosphere has risen by carbon dioxide made up most of the atmo 英语句子划分急Carbon dioxide ,which makes a barrier between us and Carbon dioxide If the () of carbon dioxide in the atmosphere is increased a If you die.The world will have less carbon dioxide and pollu 英语填空辣.The plants can absorb carbon dioxide and give off xoyg 英语翻译They remove dust and change carbon dioxide into the oxyg 英语翻译Carbon dioxide (CO2) is considered to be one of the gree 翻译:we know that the levels of carbon dioxide have increased