但如今，它面临着严峻的考验：在73个Gavi延长支持的国家中，有三分之一要么正处于过渡期，要么刚刚结束过渡期。
But it is now being put to a stern test: one-third of the 73 countries to which Gavi extends support are either in the midst of the transition process or have just completed it.