These days/nowadays/at the present time/in this day and age.
These days we eat a lot of junk food.
After referring to a time in the past we could say, "... in those days we ate more home cooked food."
These days we do this/in those days we did that.
2015年3月28日
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"These days" means at the present time, and indicates that the statement may not have been true in the past.