I was very impressed with how the countries themselves got together to decide which ones would be the first three to introduce it, because the vaccine supplies were limited in year one.
令我印象深刻的是这些国家如何组织起来共同决定最先在哪三个国家开展项目，因为一年内的疫苗供应是有限的。
I was very impressed with how the countries themselves got together to decide which ones would be the first three to introduce it, because the vaccine supplies were limited in year one.
令我印象深刻的是这些国家如何组织起来共同决定最先在哪三个国家开展项目，因为一年内的疫苗供应是有限的。
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