4周搞定2000+托福核心词
perimeter = peri(周围) + meter(测量) = 测量一圈→周边
periodical = peri(周围) + od(道路) + ical(…的) = 周围道路走一圈的→周期的
odor = od(道路) + or(表名词) = 气味
electrodee = electr(电) + od(道路) + e(名词后缀) = 电极
academic = academ(学院) + ic(…的) = 学院的
acidic = acid(酸) + ic(…的) = 酸的
走一周→周期的
periodic
常考释义
And for over the past several million years, Earth’s sort of default climate has actually been Ice Age, but we have experienced periodic regular thaws, and the last one, the one we are in now, started about 11 thousand years ago.
在过去的几百万年里，地球的主要气候特征实际上是冰河纪，但实际上它也有规律地解冻，而上一次解冻，就发生在一万一千年前。
来源于：听力OFFICIAL20 L2adj. 循环的；周期的【物】
That’s why we say their orbits are periodic.
这是为什么我们说他们的轨道是周期性的。
AU is the periodic table abbreviation for gold.
AU是金在元素周期表里的代号。
来自《劳拉之谜 第1季第20集》
图片源自网络
The periodic table is a chart that reflects the periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number(the number of protons in the nucleus).
元素周期表是按原子序数（元素原子核中质子的数量）由小到大依次排列，反映化学周期性和元素的物理特征的图表。
来源于：阅读OFFICIAL16 P2Thus when the series of elements was written so as to begin a new horizontal row with each alkali metal, elements of the same groups were automatically assembled in vertical columns in a periodic table of the elements.
因此，当每一新行都以碱性金属元素开始并逐步将这一系列的元素排列出来时，元素周期表中同一组中的元素就会自动归入一个垂直纵列中。
来源于：阅读OFFICIAL16 P2When the German chemist Lothar Meyer and (independently) the Russian Dmitry Mendeleyev first introduced the periodic table in 1869-70, one-third of the naturally occurring chemical elements had not yet been discovered.
当德国化学家迈耶（Lother Meyer）和（彼此独立的）俄国化学家门捷列夫在1869年到1870年间首次发布元素周期表时，有三分之一的天然化学元素还没被发现。
来源于：阅读OFFICIAL16 P2Yet both chemists were sufficiently farsighted to leave gaps where their analyses of periodic physical and chemical properties indicated that new elements should be located.
然而这两位化学家都极富远见，他们在周期表上留白，对元素物理性和化学性的分析空白处还有新的元素有待发现。
来源于：阅读OFFICIAL16 P2Because there is no space in the periodic table between these two elements, Mendeleyev suggested that the atomic mass of indium be changed to a completely different value, where it would fill an empty space between cadmium and tin.
但是因为在周期表中这两个元素之间没有缝隙，由此门捷列夫提出铟的原子质量变为截然不同的一个值，这样就可以将其置于镉和锡之间的空位。
来源于：阅读OFFICIAL16 P2In fact, subsequent work has shown that in a periodic table, elements should not be ordered strictly by atomic mass.
事实上，接下来的研究表明，元素周期表中元素不能严格按照原子质量排列。
来源于：阅读OFFICIAL16 P2For example, tellurium comes before iodine in the periodic table, even though its atomic mass is slightly greater.
例如，尽管碲的原子质量比碘略大，但在元素周期表中，它却排在碘前面。
来源于：阅读OFFICIAL16 P2The close correspondence between the observed properties of gallium and Mendeleye Vs predictions for eka-aluminum lent strong support to the periodic law.
镓所表现出的特性和门捷列夫对“铝下元素”的预测一一对应，这为元素法则提供了一个强有力的依据。
来源于：阅读OFFICIAL16 P2The structure of the periodic table appeared to limit the number of possible elements.
元素周期表的框架似乎限制了可能存在的元素数量。
来源于：阅读OFFICIAL16 P2Consequently, the timing and rhythms of biological functions must closely match periodic events like the solar day, the tides, the lunar cycle, and the seasons.
因此，生物功能的时间与节律也就理所应当必须与昼夜交替、潮涨潮落、月圆月缺和四季更迭这样的周期性事件保持大体一致。
来源于：阅读OFFICIAL13 P2By isolating organisms completely from external periodic cues, biologists learned that organisms have internal clocks.
通过将生物与外界的周期性现象完全隔离，生物学家们发现生物的确有生物钟。
来源于：阅读OFFICIAL13 P2Animals need natural periodic signals like sunrise to maintain a cycle whose period is precisely 24 hours.
动物需要日出等自然界的周期信号来保持24小时的循环周期。
来源于：阅读OFFICIAL13 P2In places, the water table is declining at a rate of a meter a year, necessitating the periodic deepening of wells and the use of ever-more-powerful pumps.
有的地方地下水位的下降速度甚至达到了每年1米，迫使人们周期性的加深水井并使用更有力的水泵。按现今的下降速度来估计，大部分地下蓄水将在40年内耗尽。
来源于：阅读OFFICIAL3 P2adj. 间歇的；间发性的；定期的
The bank agreed to make periodic payments to the construction company.
银行同意定期付款给建筑公司。
And for over the past several million years, Earth’s sort of default climate has actually been Ice Age, but we have experienced periodic regular thaws, and the last one, the one we are in now, started about 11 thousand years ago.
在过去的几百万年里，地球的主要气候特征实际上是冰河纪，但实际上它也有规律地解冻，而上一次解冻，就发生在一万一千年前。
来源于：听力OFFICIAL20 L3adj. 特定历史时期的
The modifications are in keeping with the periodic features of the home.
这些改造与房屋的历史风格一致。
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