Công dụng bất ngờ của lỗ tròn trên đầu dao
Nhiều người nội trợ đến bây giờ vẫn thắc mắc vì sao một số con dao, đặc biệt là dao lớn để chặt xương, băm thịt lại có một lỗ nhỏ trên đầu, gần mũi.
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