When can I use the expression "it's a whole another story"?
"It's a whole other/another story" is a casual expression used to say that something is completely different. The speaker has used this expression to compare single-use plastics used in the West versus Japan, which is completely different. You can use it to compare or contrast two very different situations or contexts. Ex: Education in Northern European countries is often heavily subsidized or free. However, in America it is a whole another story. Ex: You're allowed to take phone calls on subways in America, however, it's a whole other story in Japan.
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