It's used for admission to universities where English is the medium of instruction, and it's also used for professional certification purposes.

可以用在英语作为教学用语的大学入学考试，可以用在职业证书考试。

English is still the main medium of instruction in Nigeria.

【medium】在尼日利亚英语仍然是主要的教学媒介语言。

A school nearby saw its enrolment rise over 50% in six months when it switched the medium of instruction from Hindi to English last April.

去年4月，附近一所学校将教学语言从印度语改为英语后，入学率在六个月内上升了50%。

Moreover, many universities around the world use English as the medium of instruction, making proficiency in the language a prerequisite for higher education.

此外，世界上许多大学都使用英语作为教学语言，这使得精通该语言成为接受高等教育的先决条件。