for years now, we have been troubled by air pollution caused by uncontrolled industry. our streets have been an embarrassment because of the trash that can be seen everywhere. my fellow citizens, i promise that i will help to clean up this city from its messy state. i also promise that within the first three months of my term, i will get the industry to take more responsibility for our environment. i will demand that anyone damaging our environment should be arrested. please give me the opportunity to serve you and our city.
for years now가 해설에서 지금까지 여러해동안 이라고해석되더라구요 일종의숙어표현인가요??