According to the number of native speakers, English is the official language of the most used countries in the world, the most widely used second language in the world, and one of the official languages of the European Union, the most international organizations and Commonwealth countries, but it has only the third mother tongue in the world, less than Mandarin Chinese and Spanish.
The leading position of Britain and America in culture, economy, military, politics and science in the last two centuries has made English an international language, and English is also the language with the closest relationship with computers. Most programming languages are related to English. With the use of the Internet, English is more widely used. English is one of the working languages of the United Nations.
Others:
Training class: a training activity aimed at improving students' knowledge and skills, or improving their mentality and forming certain habits. In the modern era of fierce economic competition, high-skilled and high-quality talents have competitive advantages, and corresponding training institutions have emerged.
Type:
Primary training course: it is mainly set up to master the basic knowledge of a certain skill or major, such as primary business English training course.
Intermediate training class: those who want to expand extended learning on the premise of mastering certain skills or professional basic knowledge, such as intermediate mechanic training class.
Advanced training class: a training class that wants to learn knowledge and skills in depth on the basis of mastering intermediate requirements, such as a training class for senior accountants.
Business training course: under the premise of charging reasonable fees, it provides certain conditions for students to impart certain professional knowledge and skills, such as professional etiquette course training.
Reference to the above content: Training Course-Baidu Encyclopedia