1) The population of Ulaanbaatar, Mongolia has rapidly increased, with 41.8% of Mongolia's population living in the capital city in 2013.
2) There has also been rapid growth in vehicle ownership in Ulaanbaatar, with the number of registered vehicles increasing by an average of 15% per year over the last decade.
3) This rapid increase in both population and vehicles in Ulaanbaatar has contributed to worsening traffic congestion and air pollution in the city.
Classroom language refers to the routine language used regularly in the classroom, such as giving instructions or praise. It takes time for both teachers and students to learn this aspect of language when teaching a new language. Teachers can facilitate learning classroom language by starting with short, simple commands and progressively making them longer or using alternate phrases that mean the same thing. It is also important to frequently use the introduced classroom language concepts so students become accustomed to them and are eventually able to employ the language themselves. Visual aids can help students learn and remember the new classroom language.