เรียงคำต่อไปนี้ให้เป็นประโยคที่ถูกต้อง
Penguins are flightless birds they cannot fly but they are very good at swimming when they swim their wings push them at speeds up to 15 miles per hour they can swim faster than a human they live only at the south pole the emperor penguin is 4 feet high when it stands up and weighs about 40 pounds or 18 kilograms