The English for "mechanical major" is: mechanical major.

Among them, English "Mechanical" is mechanical and English "professional" is professional.

For example:

The English for "environmental major" is: environmental major.

The English for "Medical Major" is: medical major.

The English for "law major" is: law major.

The English for "history major" is: history major.

English for "literature major" is a literature major.