💡 Detailed Explanation
Translation of sentence: Yesterday I went to the mountains together with my friend. We gathered at the station at 7:00 in the morning.
- Grammatical point: Location of gathering/focus particle に (ni).
- Explanation: The verb 集まる (あつまる - to gather) represents a concentration/focus of movement to a single target location. In Japanese, '駅に集まる' uses the particle 'に' to mark this location of concentration.