下面这句话中的out of 如何理解和翻译？

Question

Over one million Americans are living with the virus, out of an estimated thirty-three million people worldwide.

Answer 1

Over one million Americans are living with the virus, out of an estimated thirty-three million people worldwide.
这句话也可以倒过来说...
Out of an estimated thirty-three million people worldwide, over one million americans are living with the virus.

在全球大约3300万人当中，有一百万的美国人已经感染病毒。（为强调后半句而倒过来，意思是一样的。）

Out of 在这里的意思，可以理解为：在...当中

Answer 2

out of an estimated thirty-three million people worldwide.的意思就是预计全球共有3300000人（患禽流感）