例句與造句

1. In 2014, according to the World Marrow Donor Association, stem cell products provided for unrelated transplantation worldwide had increased to 20, 604 ( 4, 149 bone marrow donations, 12, 506 peripheral blood stem cell donations, and 3, 949 cord blood units ).
2. It's difficult to find peripheral blood stem cell donation in a sentence. 用peripheral blood stem cell donation造句挺難的