vocabulary   n.(某人掌握或使用的) 词汇，词汇量; (某一语言的) 词汇; (某学科中所使用的) 词汇;

There are many different cycles in nature, such as the cycle of seasons.

A cycle is a series of events that repeat, such as the daily cycle of light and dark.

(The time it takes for a cycle to repeat itself is its period.)   一个循环重复自己所需要的时间是它的一个周期 

(The number of times a cycle repeats itself within a period of time is its frequency.)   一个周期在一段时间内重复的次数就是它的频率

cycle    n.自行车; 摩托车; 循环; 整套，整个系列(如机器的运转);

daily   adj.每日的; 日常的; 每个工作日的; 按日的;

The time it takes for a cycle to a repeat itself is its period     定于从句，修饰the time ； it是形式主语，to repeat itself是真正内的主语        it takes a cycle time to repeat itself  一个循环重复自己所需要的时间是它的一个周期 

frequency  n.发生率; 出现率; 重复率; 频繁; (声波或电磁波振动的) 频率;

The number of times a cycle repeats itself within a period of time is its frequency.  

the number of times 次数    a cycle repeats itself :cycle名词   在一定时间内，不断重复的一个周期的次数，叫做频率。

The number of times

To evolve means to change or improve over a period of time.

In biology, the theory of evolution says that advanced life forms such as humans have evolved from lower forms of life.

(According to science we have all evolved from simple one-celled organisms.)

(Life forms evolve because they have to adapt in order to survive.)

evolve  v.(使) 逐渐形成，逐步发展，逐渐演变; 进化; 进化形成;

biology  n.生物学; 生理; 

evolution  n.进化; 演变; 发展; 渐进;

advanced   adj.先进的; 高级的; 高等的; (发展) 晚期的，后期的;

lower  adj.(尤指位于同类物品或成对物品中另一个的) 下面的，下方的; 在底部的; 近底部的; 朝海岸的; 低洼的; 向南的;

life forms  n.生物; 活物;

one-celled  单细胞的          cell     n.单间牢房; 牢房; (修道士或修女住的) 小房间; 细胞;

organism    n.有机体; 生物; (尤指) 微生物; 有机组织; 有机体系;

A force of attraction brings two objects closer together, such as the force of gravity.

A force of repulsion pushes two objects away from each other, such as the force between two electrons.

(If two people are attracted to each other, they want to be together.)

(Gravity is a force of attraction between two objects with mass.)   重力是两个有质量的物体之间的引力

force   n.武力; 暴力; 力; 力量; 强大效力; 巨大影响;

attraction  n.(尤指两性间的) 爱慕，吸引; 向往的地方; 有吸引力的事; 有吸引力的特征(或品质、人);

closer    adv.接近; 靠近; 紧挨着; 不远地;

repulsion   n.嫌恶感; 强烈的反感; 憎恶; 排斥力; 斥力;

electron   n.电子;

mass  n.团; 块; 堆; 大量; 许多; (常指混乱的) 一群，一堆;    重力是两个有质量的物体之间的引力

To transform means to change from one form into another.

A transformation occurs when an object takes on a new appearance or structure.

(In marriage, a wife's attempt to transform the behavior of her husband is often unsuccessful.)

transform  v.使改变形态; 使改变外观(或性质); 使改观;

transformation   n.(彻底的) 变化，改观，转变，改革; (用于南非) 民主改革;

appearance  n.外貌; 外观; 外表; (尤指突然的) 抵达，到来; 起源; 出现; 首次使用;

structure  n.结构; 构造; 结构体; (尤指) 建筑物; 精心组织; 周密安排; 体系;

attempt  n.企图; 试图; 尝试; 杀人企图; (为超越某事物的) 尝试，努力;

To inherit something means to get it without having to ask or work for it.

A child from a very rich family,  may inherit a lot of money.

(He inherited a large fortune when his parents died, so he doesn't have to work anymore.) 为什么是money

(Eye and hair color are inherited traits.)

inherit   v.继承(金钱、财产等); 经遗传获得(品质、身体特征等); 接替(责任等); 继任;

fortune   n.(尤指影响人生的) 机会，运气; 大笔的钱; 巨款; (个人、家庭、国家等的) 发展变化的趋势，命运，际遇;

trait   n.(人的个性的) 特征，特性，特点;

inherited traits.   遗传特征

(To change or improve over a period of time)   to  evolve

(To take on a new appearance or a form)    to transform

(To receive something without having to work for it)    to inherit

(What can breaks things apart?)    repulsion

(What is the series of events that repeat itself?)      a cycle

(What process has a nable of life to become more complex?)   evolve

(Days,years and seasons are all examples of what?)   cycle

(A good friend of mine has never had to work, because everything he has is inherited.)

(Some people become wealthy by? )  inherit

(What kind of force bring things together? )   a force of attraction

(We say that opposites attract. However, in human relationships, though opposites may attract, the relationship may not last long. People who have much in common may not attract each other but may have a longer lasting relationship.)

(Gravity is a force of attraction between two objects with mass. In human interactions, there are also forces of attraction. Two people may find each other attractive. If two people are attracted to each other, they want to be together.)

opposite   n.对立的人(或物); 对立面; 反面;

lasting  adj.继续存在的; 持久的; 耐久的;

longer   adj.(长度或距离) 长的;

attractive   adj.性感的; 妩媚的; 英俊的; 诱人的; 吸引人的; 令人愉快的; (事物) 有吸引力的;

be attracted to  被吸引