1. aircurtain:

aircurtain is a device that creates a barrier of air to separate two different environments, such as inside and outside of a building. It is commonly used at the entrance of a building to prevent outside air, dust, insects, and other pollutants from entering the building while maintaining an open entrance for people to pass through.

2. Pronunciation:

/ˈeəkəˌtn/

Note: The "ai" in "air" is pronounced as /eə/, similar to the word "hair".

3. Usage:

Aircurtains are typically installed above doorways or entrances and work by blowing a controlled stream of air downward at high velocity. This creates an invisible barrier that separates the two environments without obstructing the passage of people.

4. Examples:

1) The new office building has an advanced aircurtain system installed at its entrance to keep out dust and pollutants.

新办公楼在处安装了先进的空气幕帘，以防止灰尘和污染物进入。

2) The store's aircurtain was turned off during the hot summer days to allow for better ventilation.

夏季炎热的日子里，商店的空气幕帘被关闭，以便更好地通风。

3) The restaurant's aircurtain was not functioning properly, causing cold drafts to enter every time someone entered or exited.

餐厅的空气幕帘功能不正常，每次有人进出时都会导致冷风进入。

4) The supermarket invested in energy-efficient aircurtains to reduce their electricity consumption and save on utility bills.

超市投资购买了节能的空气幕帘，以减少用电量并节省水电费。

5) The aircurtain at the hotel's entrance was decorated with festive lights for the holiday season.

酒店处的空气幕帘装饰着节日灯光。

5. Synonyms:

- Air door: a type of aircurtain that is installed vertically on both sides of an entrance.

- Air screen: another term used to describe an aircurtain, usually used in Europe.

- Fly fan: a colloquial term for an aircurtain, often used in the UK.

- Wind curtain: a literal translation of "aircurtain" in some languages.

6. Editor's Summary:

Aircurtains are an essential part of building design to maintain indoor air quality and energy efficiency. They provide a barrier between two environments while still allowing for easy passage of people and objects. With advancements in technology, aircurtains have become more energy-efficient and can be customized to fit different building entrances.