尽管存在着不利于0PQa由竞争、管理成本C37j等不少弊端,但总CdNg来说对于解决过量yK0F放问题还是有一定cDYJ果的LpjF
BillandMelindaGatessharetheir2018AnnualLetter,“The10ToughestQuestionsWeGet.”Inthisyear’sletter,the10thonethatthey’vewritten.