In the future, the linguistic diversity in the world has almost vanished. Everyone could speak one or more ‘international language’. Those who speak ‘international language’ as their second language are also trying to speak just as good as those who speak ‘international language’ as their first language.
The majority of Chinese people still use one single language - mandarin in their daily life. Although they began to learn English(one of the ‘international language’) when they are young, they lacked daily practice. Their innate ability to pronounce every sound was lost at the same time and the only part left is to serve daily language - mandarin. Among those who wants to go abroad, a set of intrusive tools that go into their mouth became famous, and they use it help themselves to pronounce perfect English.
This set of tools mainly dissolve the difference between Chinese and English pronunciation. The tools focus on the relationship between lips, tongue and the front side of the upper and lower jaws. For example, the tool #10 is a handle connected to a semicircle made of steel wire. Tool #10 is specifically designed to help pronounce the sound of /ei/. When using, the user needs to open his mouth and then place the both sides of the semicircle in between the upper left and right gums and lips. After being placed, the user's lips are always in a horizontal rectangle shape, which is the shape needed for the /ei/ sound.