defence

defence的音标是[dɪˈfens]，基本翻译是防御、防卫。速记技巧可以是将其拆分为词根记忆，其中de-表示否定，fend表示打击，所以defence的意思就是防卫、防御。

英文单词“defence”的词源主要有：

1. 词根“defend”和词缀“-ence”：这个单词来源于拉丁语和法语，词根“defend”意为“保护、防卫”，词缀“-ence”表示行为或状态。

变化形式：

1. 过去式：defended。

2. 过去分词：defended。

3. 现在分词：defending。

4. 复数：defences。

相关单词：

1. “defend”意为“保护、防卫”，可以引申为“辩护”，表示为“defence lawyer”（辩护律师）。

2. “offence”意为“犯罪、侵害”，可以与“defence”构成反义词，表示进攻和防御的对比。

3. “insurance”意为“保险”，其复数形式“insurances”与“defence”有相似的拼写和发音，具有一定的关联性。

4. “defensive”意为“防御的”，是一个形容词，可以用来描述军事设施、战略等防御性质的事物。

5. “defender”意为“防守者、辩护者”，是一个名词，可以用来描述在战争、辩论等场景中防守或辩护的人。

6. “defensive driving”意为“防御性驾驶”，是一种驾驶技巧，强调在紧急情况下如何避免事故或被攻击。

7. “defensive strategy”意为“防御战略”，是一种军事策略，强调在敌方进攻时采取的防守措施。

8. “defensive line”意为“防线”，是一个军事术语，指在战争中用于阻挡敌方进攻的线状防御工事。

9. “defendable”意为“可辩护的”，是一个形容词，表示在法律、道德或其他领域中，某些情况或行为可以被辩护或解释。

10. “self-defence”意为“自卫”，是一个名词短语，表示在受到攻击或威胁时，为了保护自己而采取的防御措施。

常用短语：

1. national defence

2. air defence

3. land defence

4. sea defence

5. military defence

6. strategic defence

7. coastal defence

例句：

1. We must strengthen our national defence to ensure our safety.

我们必须加强国防建设，以确保国家安全。

2. The army is responsible for land defence against external threats.

军队负责抵御外来威胁，保卫领土安全。

3. The government is committed to improving sea defence measures to protect coastal areas from flooding.

政府致力于改善海防措施，以保护沿海地区免受洪水侵袭。

4. Strategic defence is crucial for ensuring national security.

战略防御对于确保国家安全至关重要。

5. Coastal defence measures are essential to protect our coastline from natural disasters.

海岸防卫措施对于保护海岸线免受自然灾害的侵袭至关重要。

6. Air defence is a crucial component of national defence.

空中防御是国家防御的重要组成部分。

7. We must maintain a strong military to defend our country from external threats.

我们必须保持强大的军事实力，保卫国家不受外来威胁。

英文小作文：

National Defence: The Foundation of Our Security

National defence is the foundation of our security, protecting our country from external threats and ensuring our safety. From land defence against external aggressors to strategic defence in times of war, national defence is a crucial aspect of our society that must be maintained and strengthened.

However, national defence goes beyond military strength. It also includes measures to protect our coastal areas from natural disasters, such as sea defence measures, and air and space surveillance to ensure the safety of our skies and space exploration to safeguard our planet.

In conclusion, national defence is not just about military power, but also about protecting our country and its people from all forms of external danger. We must maintain a strong national defence strategy that is inclusive and adaptable to changing circumstances, so that we can be confident and secure in the face of any challenge.