We asked, what is the percentage of the world's one-year-old children who have got those basic vaccines against measles and other things that we have had for many years: 20, 50 or 80 percent?
「はしかなどの 基本的なワクチンを接種する 「はしかなどの 基本的なワクチンを接種する １歳児の割合は どれくらいか？」 １歳児の割合は どれくらいか？」 20%か50%か80%か？