Learn what "is the only" means, when people say it, and how to use it naturally in English.

It means the speaker is stressing that this method is necessary to get essential information.
From Billionaire’s Betrayal, Episode 15
The speaker repeats that the plan is necessary to obtain the information they need.
Use this when trying to justify a necessary step in a plan or investigation. It is not a casual phrase and may sound manipulative if overused.
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