Mang nghĩa"trong khi"
=You use whereas to introduce a comment which contrasts with what is said in the main clause.
- Pensions are linked to inflation, whereas they should be linked to the cost of living.
- Whereas the population of working age increased by 1 million between 1981 and 1986, today it is barely growing.
- Doctors’ salaries have risen substantially, whereas nurses’ pay has actually fallen.
- Whereas knowledge can be acquired from books, skills must be learned through practice.