annual runoff的音標(biāo)為[??nj??l r?n(?)f]，基本翻譯為“年徑流”，速記技巧為：annual（年度的）+runoff（徑流）→年徑流。

Annual Runoff這個(gè)詞的詞源可以追溯到拉丁語(yǔ)annus（一年）和potare（煮，煮沸），表示一年一次的“流出”。這個(gè)詞在英語(yǔ)中的形式變化相對(duì)較少，主要涉及到復(fù)數(shù)形式Annual Runoffs和過(guò)去式、過(guò)去分詞形式Annualized Runoff。

相關(guān)單詞：

1. Runoff Elections：選舉，通常指在大選日之后的補(bǔ)選，通常在候選人得票未過(guò)半的情況下進(jìn)行。

2. Annualized：表示每年重復(fù)或類似的情況，例如annualized salary表示年薪。

3. Runoff：除了annual runoff外，還有排水道的意思，在農(nóng)業(yè)中表示農(nóng)田排水。

4. Runoff Season：雨季，指降雨量較大的季節(jié)。

5. Runoff Model：一種水文學(xué)模型，用于模擬徑流過(guò)程。

以上這些單詞都與Annual Runoff這個(gè)詞有著密切的聯(lián)系，體現(xiàn)了自然科學(xué)的詞匯中常見(jiàn)的抽象化和多義性。

常用短語(yǔ)：

1. annual runoff budget

2. annual runoff flow

3. annual runoff volume

4. cumulative annual runoff

5. long-term annual runoff

6. short-term annual runoff

7. annual runoff ratio

例句：

1. The annual runoff of the river has increased by 20% due to environmental protection measures.

2. The company"s cumulative annual runoff has exceeded its original plan by 5%.

3. The long-term annual runoff of the region is expected to increase by 5% due to the construction of a new dam.

4. The short-term annual runoff of the reservoir is expected to be stable at around 50 million cubic meters.

5. The annual runoff ratio of the company"s products has exceeded 90%.

6. The annual runoff of the rainforest is so large that it can be used to feed a large city for a year.

7. The amount of water in the river has decreased due to a decrease in the annual runoff.

英文小作文：

Water Resources Management: The Importance of Annual Runoff

Water resources management is crucial for sustainable development, and one of the key factors is the annual runoff of rivers and lakes. Annual runoff refers to the amount of water that flows into a river or lake from various sources during a certain period of time, which determines the amount of water available for use by humans and other living beings. If the annual runoff is too low, it may lead to water scarcity and affect human activities such as agriculture, industry, and domestic use. On the other hand, if the annual runoff is too high, it may cause flooding and other hazards, which can also affect human lives and property. Therefore, effective water resources management requires a comprehensive understanding of the annual runoff and its variations, which can be used to predict future water supply and demand, develop appropriate water management plans, and ensure sustainable development of water resources.