.六级常见单词替换.1. important=crucial,critical significant essential vital2. common=universal, ubiquitous(if something is ubiquitous, it seems to be everywhere)4. difficult=formidable5. understand=discern6. all the time-continually, continuously, constantly, perpetually7. as a resultconsequently、8. before-prior to9. begincommence10. bettersuperior11. big-major, significant, substantial12. have-be equ
