B1 to stop something from happening or someone from doing something阻止,妨碍;预防
More examples
The police seem to be powerless to prevent these attacks.
She would go over the accident again and again in her mind, wishing that she could somehow have prevented it.
A block in the pipe was preventing the water from coming through.
Fierce winds prevented the race from taking place.
The law has done little to prevent racial discrimination and inequality.
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