half-life

half-life的音标是[hɑːf ˈlevə]，基本翻译是半衰期。速记技巧可以是谐音记忆：“哈弗里发”（半衰期）。

Half-life这个词的词源可以追溯到拉丁语“semi” (半)和“latus” (边)的组合，表示“半边”或“一半”。它的变化形式主要有复数形式“half-lives”和过去式“halflived”等。

相关单词：

“quartile” (四分位数)：这个词来源于拉丁语“quartus” (第四)，与half-life一起使用时表示数据分布的四分位数，即数据集的四分之一。

“semilogy” (半对数图)：这个词由“semi” (半)和“logistic” (对数图)组成，表示一种图表类型，通常用于表示半对数关系。

“halftime” (中场休息)：这个词来源于体育比赛，表示比赛的中间休息时间，其来源与half-life有关，因为比赛通常分为两半进行。

“halfcircle” (半圆)：这个词由“half” (半)和“circle” (圆)组成，表示半圆形。

“halfdimension” (半尺寸)：这个词由“half” (半)和“dimension” (尺寸)组成，表示一半的尺寸。

“halffraction” (一半分数)：这个词由“half” (半)和“fraction” (分数)组成，表示分数的一半。

“halfflow” (半流速)：这个词由“half” (半)和“flow” (流速)组成，表示流体速度的一半。

“halffunding” (一半资金)：这个词由“half” (半)和“funding” (资金)组成，表示一半的资金量。

“halffreeze” (半冰点)：这个词由“half” (半)和“freeze” (冰点)组成，表示冰点的一半。

以上这些单词都与half-life有着密切的联系，反映了其在不同领域的应用和发展。

常用短语：

1. half-life decay

2. half-life time

3. half-life rate

4. half-life curve

5. half-life decay rate

6. half-life decay process

7. half-life recovery

例句：

1. The radioactive substance has a half-life of 5 days, meaning that after half the substance has decayed, the remaining half will still decay for another 5 days.

2. The half-life of plutonium is about 24,000 years, making it difficult to remove from the environment.

3. The half-life of carbon-14 is about 5,730 years, making it a useful tool for dating organic materials.

4. The half-life curve for a radioactive substance shows how its concentration changes over time.

5. The half-life decay rate of a substance depends on its chemical and physical properties.

6. Half-life decay processes can be slow and difficult to observe, but they are essential for understanding the nature of radioactivity.

7. Half-life recovery refers to the process of removing radioactive material from the environment.

英文小作文：

Half-Life: The Mystery of Radioactivity

Radioactivity is a phenomenon that has puzzled scientists for centuries. One of the key characteristics of radioactivity is the concept of half-life, which refers to the time it takes for half of a radioactive substance to decay. This concept sheds light on the nature of radioactivity and has opened up a new field of research in the field of radiation science and technology.

Half-life plays an important role in understanding the behavior and fate of radioactive substances in the environment. It also helps us to estimate the age of organic materials and to develop effective methods for remediating radiation hazards. Furthermore, half-life is a key factor in radiation protection, as it determines how long a substance remains hazardous and requires remediation.

However, understanding half-life is not simply a matter of counting衰变周期。 It involves complex chemical and physical processes that occur over time。 Understanding these processes requires a deep understanding of radiation physics and chemistry。

In conclusion，half-life is a fundamental concept in radioactivity research and has opened up new avenues for scientific exploration。 Understanding half-life better will undoubtedly lead to greater progress in radiation science and technology。