Các câu ví dụ cho từ unknown

1. Health officials are urging the public to avoid consuming poultry with unknown origins and immediately seek help when they find sick or dead poultry.

2. Since earlier this month, Quang Ninh authorities have made several arrests after interrupting deliveries of Covid-19 test kits of unknown origin, with most cases involving 2,000-5,000 kits each.