4周搞定2000+托福核心词
circadian = circ(圆，环) + dian(天) = 生理节奏的
circle = circ(圆，环) + le(反复) = 圆环反复→循环周期
formicula = form(形状) + ic(…的) + ula(名词) = 形成的东西的→公式
formula = form(形状) + ula(名词) = 公式
abolition = ab(表加强) + oleo(毁坏) + tion(表名词) = 进一步加强→进一步毁坏→废除
absorpttion = ab(表加强) + sorb(吸收) + tion(表名词) = 吸收
呈环形的→循环,流通
circulation
常考释义
Ecosystems thus involve the circulation, transformation, and accumulation of energy and matter through the medium of living things and their activities.
因此生态系统包括通过生物媒介和活动而产生的循环、转换和能量及物质的积累。
来源于：阅读OFFICIAL19 P2n. 传递；流传；流通
A number of forged tickets are in circulation .
有一些假入场券在流通。
There 's so much stolen time in circulation.
失窃的大量时间正在市面上流通。
来自《时间规划局》
图片源自网络
Beginning in the 1160s, the opening of new silver mines in northern Europe led to the minting and circulation of vast quantities of silver coins.
从十二世纪六十年代欧洲北部开辟了新的银矿开始，大量银币开始铸造和流通。
来源于：阅读OFFICIAL46 P2The ancestors of these animals already had a circulation system, and they were mobile, so that they could move to water to drink.
这些动物从祖先起就已经有了一个流通系统，它们可以移动，所以可以挪到水边饮水。
来源于：阅读OFFICIAL44 P1And then before we decide to include a book in the sale, we review its circulation history again, which can take a while.
然后，在我们决定把一本书放在特卖会之前，我们会再次更新它的流通历史，这可能会花点时间。
来源于：听力OFFICIAL34 L1Extracting heat from very hot, dry rocks presents a more difficult problem: the rocks must be fractured to permit the circulation of water, and the water must be provided artificially.
要从极干热的岩石中提取热量存在一个更大的难题：岩石需要有裂缝才能让水流通，而且水必须是人工提供的。
来源于：阅读OFFICIAL21 P1n. 循环
Regular exercise will improve blood circulation.
经常锻炼会促进血液循环。
However, it lacks any sign of a hydrologic system (water circulation and distribution): there are no streams, lakes oceans or glaciers.
然而，它没有任何水文系统（水循环和分布）的迹象：没有溪流、湖泊、海洋或冰川。
来源于：阅读OFFICIAL51 P2Ecosystems thus involve the circulation, transformation, and accumulation of energy and matter through the medium of living things and their activities.
因此生态系统包括通过生物媒介和活动而产生的循环、转换和能量及物质的积累。
来源于：阅读OFFICIAL19 P2n. （报刊）发行量，销售量
The newspaper has a daily circulation of 55,000.
这份报纸的日发行量是 55,000 份。
n. （某段时间的）社交活动，交际
Anne has been ill but now she's back in circulation .
安妮一直生病，但现在又回来参加社交活动了。
n. 井漏；循环液漏失
n. 侧支循环；侧枝循环；并行循环；侧循环
n. 冷水环流；水流循环
n. 反循环；逆行循环
n. 在流通中；在从事社交活动的
n. 空气循环；空气环流
n. 血液循环，血循环
in circulation
在流通中；在从事社交活动的
lost circulation
井漏；循环液漏失
air circulation
空气循环；空气环流
collateral circulation
侧支循环；侧枝循环；并行循环；侧循环
reverse circulation
反循环；逆行循环
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