4周搞定2000+托福核心词
irreversible = ir(不) + re(回,翻) + vers(转) + ible(能…的) = 不能回转的→不可逆的
raport = re(回,翻) + port(拿，运) = 反复的拿，反复的运→友好关系
sustaining = sus(下，底) + tain(拿住) + ing(形容词) = 自立的
attain = at(加强) + tain(拿住) = 拿住了→获得
拿回来→保留
retain
常考释义
The survival of these craters tells us that an icy object can form and retain impact craters in its surface.
这些撞击坑的存在告诉我们，一个冰体可以形成并保留其表面的撞击坑。
来源于：阅读OFFICIAL42 P3vt. 保持；持有；保留；继续拥有
Actually, the seeds don't retain the power to germinate for very long, maybe two years.
事实上，种子的发芽能力只能持续两年左右。
They can be wild animals or domestic, and a lot of times they can talk and behave like humans, but at the same time, they retain their animal characteristics too.
这些动物或是野生的，或是家养的，而且它们往往有人一样的行为，还会说话，但同时，它们又保持了动物自身的特点。
You were concerned enough to retain my services.
我还会继续受雇于你。
来自《大西洋帝国 第1季第11集》
图片源自网络
The survival of these craters tells us that an icy object can form and retain impact craters in its surface.
这些撞击坑的存在告诉我们，一个冰体可以形成并保留其表面的撞击坑。
来源于：阅读OFFICIAL42 P3A planet's ability to retain an atmosphere depends on its temperature and mass.
一个行星保持大气的能力取决于其温度和质量。
来源于：阅读OFFICIAL16 P3The slightly larger terrestrial planets Earth, Venus, and Mars retain some heavy gases like carbon dioxide, but even their atmospheres make up only an infinitesimally small portion of their total mass.
体积稍大的类地行星，比如地球、金星和火星，保持了二氧化碳等一部分较重的气体，但即便如此，大气构成也只占它们总质量的很小一部分。
来源于：阅读OFFICIAL16 P3Even in the areas that retain a soil cover, the reduction of vegetation typically results in the loss of the soil's ability to absorb substantial quantities of water.
即便是土壤表层保持完好的区域，植被的减少会导致土壤吸收地下水的能力下降。
来源于：阅读OFFICIAL2 P1But in recent years, engineers have built great systems of levees (retaining walls) in attempts to stabilize the channels.
但是近年来，工程师们建造了堤坝（挡土墙）系统以试图加固河道。
来源于：阅读OFFICIAL52 P1Eventually, having two sets of equivalent symbols—the internal tokens and external markings—came to seem redundant, so the tokens were eliminated (circa 3250-3100 B.C.E.), and only solid clay tablets with two-dimensional symbols were retained.
最终，有两套对等的符号-内部符号和外部痕迹-这看起来累赘，所以符号被消除（大约公元前3250-3100年），只有带有二维符号的黏土碑被保留。
来源于：阅读OFFICIAL53 P1At the same time, they have retained some traditional cultural practices that are associated with particular art forms.
同时，他们还保留了一些与特定艺术形式相关的传统文化习俗。
来源于：阅读OFFICIAL41 P1However, the cycle was retained if either of the factors was allowed to operate alone: if predators were excluded but food was not added (food effect alone), or if food was added in the presence of predators (predator effect alone).
但是，在任意一个因素单独存在时，循环都会出现：不管是捕食者被移除，食物不添加（也就是只有食物影响）；还是食物在捕食者存在的情况下被添加（也就是只有捕食者影响）。
来源于：阅读OFFICIAL27 P3Stone statues were worked from single rectangular blocks of material and retained the compactness of the original shape.
石制雕像是用长方形的石料制成，并且保持着原有的形状和比例。
来源于：阅读OFFICIAL11 P1By 1800 more than a thousand steam engines were in use in the British Isles, and Britain retained a virtual monopoly on steam engine production until the 1830s.
19世纪时，英国已经拥有上千台蒸汽发动机，直到19世纪30年代以前，英国在蒸汽机的生产方面一直处于实质性垄断地位。
来源于：阅读OFFICIAL6 P1The whale retained a tail and lacked a fluke, the major means of locomotion in modern cetaceans.
虽然 Ambulocetus natans 保留了尾巴，但它们缺少现代水生鲸类动物用于行动的主要身体部位——尾片。
来源于：阅读OFFICIAL2 P2For example, some early societies ceased to consider certain rites essential to their well-being and abandoned them, nevertheless, they retained as parts of their oral tradition the myths that had grown up around the rites and admired them for their artistic qualities rather than for their religious usefulness.
例如，一些早期社会的人们认为有的仪式对他们的幸福生活来说不再是必需品，并且取消了那些仪式，虽然如此，人们还是保留了那些口头传述故事的传统并且热爱从这些仪式里发展起来的神话，出于它们的艺术性，而不是宗教原因。
来源于：阅读OFFICIAL1 P2vt. 保持；继续容纳
This information is no longer retained within the computer's main memory.
这样的数据不再保留在计算机的主存储器中。
vt. 聘请（律师等）
He decided to retain him for the trial.
他决定聘请他为出庭律师。
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