In our project timeline, the twenty-first milestone is crucial for our success.
This is the twenty-first century, you know.
He remembered the old shebeen where he celebrated his twenty-first birthday.
Environmental protection is becoming a new pillar of civilization in the twenty-first century.
The twenty-first century has brought significant advancements in technology and communication.
The release of the twenty-first movie in the series excited fans worldwide.
The twenty-first element on the periodic table is known for its unique properties.
Dwudziesty pierwszy element w układzie okresowym znany jest ze swoich unikalnych właściwości.
On our list, her name is marked as number twenty-first for the project.
The twenty-first athlete to cross the finish line was a local favorite.
This painting is from the twenty-first year of the artist's career, showcasing his evolution.
I remember how shocked I was on a visit to the twenty-first century.
Pamiętam, jak zaszokowała mnie wizyta w dwudziestym pierwszym wieku.
I was given one ten times that size on my twenty-first birthday.
My favorite movie came out in the twenty-first year of the new millennium.
Mój ulubiony film wyszedł w dwudziestym pierwszym roku nowego tysiąclecia.