B2 in a way that is successful and achieves what you want有效地
C2 used when you describe what the real result of a situation is实际上;事实上
More examples
The department needs three more computers in order to work most effectively.
The older drugs didn't deal effectively with the malaria parasite.
The troops had camouflaged themselves so effectively that the enemy didn't notice them approaching.
She demonstrated the software very effectively.
He might have to resign or he might be demoted, but either way, his career is effectively over.
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