how long

how long的音标是[haʊ lɔːn]。基本翻译是“多久；多长时间”。速记技巧可以用谐音“好龙”来帮助记忆，其中“好”字谐音为“how”，“龙”字谐音为“long”。

"how long"这个词的词源可以追溯到古英语中的"how lang"或"how long"，意为"多么长"。它的变化形式包括过去式"how long"，过去分词"how long"，现在分词"how long"，以及形容词形式"how long"。

相关单词：

1. "long"：这是一个基本的英语单词，意为"长的"，其词源可以追溯到原始印欧语词根"lang-"或"long-"，意为"长"。

2. "length"：这个词表示长度，其词源可以追溯到拉丁语"longitudo"。

3. "extraordinary"：这个词意为"非凡的"，其词源可以追溯到拉丁语"extraordinarius"，意为"超出常规的"。

4. "duration"：这个词表示持续的时间，其词源可以追溯到拉丁语"durare"，意为"持续"。

5. "prolong"：这个词意为"延长"，其词源可以追溯到拉丁语"pro-"和"longus"，意为"向前"。

6. "elongate"：这个词意为"拉长"，其词源可以追溯到拉丁语"elongare"，意为"拉长"。

7. "longitude"：这个词表示经度，其词源可以追溯到拉丁语"longitudo"，意为"长度"。

8. "duration of time"：这个短语表示一段时间的持续时间，其构成中的“duration”就是“how long”的变化形式。

9. "time span"：这个词表示一段时间的范围，其构成中的“span”意为“跨越”，与“how long”有相似的含义。

10. "extended time period"：这个短语表示一个延长的时期，其构成中的“extended”意为“扩展的”，与“how long”的含义有相似之处。

以上这些单词和短语都与“how long”有着密切的联系，并且都表示时间或长度的概念。在英语中，"how long"是一个常用的疑问词，用于询问某事物的长度或持续时间。

常用短语：

1. How long have you...? 你已经...多久了？

2. How long does it take...? 这个需要多长时间？

3. How long will...last? ...会持续多久？

4. How long have you been doing...? 你一直做...多久了？

5. It"s been...years since... 自从...已经过去几年了。

6. I"ve been wanting to do this for years. 我已经多年想要做这件事了。

7. I"ve had this for a while now. 我有这个一段时间了。

双语例句：

1. How long have you been learning English? 你学习英语多久了？

2. I don"t know how long it will take to get there. 不知道到那里需要多长时间。

3. I"ve been wanting to go on a trip like this for years. 我已经多年想要去这样的旅行了。

4. It"s been two years since I last saw my family. 自从上次见到家人已经过去两年了。

5. I"ve had this book for a while now and I love it. 这本书我已经有一段时间了，我很喜欢它。

6. I"ve been working hard to finish this project by the end of the month. 我一直在努力工作，希望能在这个月底前完成这个项目。

7. I"ve been thinking about quitting my job for a while now. 有一段时间我一直在考虑辞职了。

英文小作文：

How Long Can We Survive Without Water?

Water is essential for human survival. Without it, we cannot survive for more than a few days at most. However, if we lose access to water for an extended period of time, we will eventually perish. In this essay, we will explore how long we can survive without water and what measures we can take to ensure our survival in such a situation.

Firstly, we need to understand that water is crucial for maintaining bodily functions such as digestion, circulation, and respiration. Without water, our bodies will begin to shut down and we will experience dehydration, which can lead to various health problems such as muscle cramps, dry mouth, and fatigue. If we lose access to water for too long, our organs will begin to fail and we will eventually die from water-related diseases or dehydration-induced shock.

Secondly, we need to consider the importance of conserving water in emergency situations. We should always have a water supply plan in place, including storing water in case of emergencies, and using water judiciously to avoid wasting it unnecessarily. In addition, we should also be aware of the importance of drinking plenty of water regularly to maintain our bodily functions and avoid dehydration.

Finally, if we find ourselves in a situation where we lose access to water for an extended period of time, we should consider other sources of water such as rainwater collection or using alternative sources such as sea water or brackish water for drinking purposes. We should also be aware of the importance of maintaining hydration by drinking plenty of water regularly and eating foods that are rich in water content such as fruits and vegetables.

In conclusion, water is essential for human survival and maintaining bodily functions. If we lose access to water for an extended period of time, we will eventually perish unless we take appropriate measures to ensure our survival by conserving water and considering alternative sources of water supply.