帮我翻译这个句子!

“Last year the agency known as UNAIDS estimated that 39 and one half million people were living with HIV. On Tuesday it reduced that by six percent to a little more than 33 million. ”
“39 and one half million ”是多少？
“that ”是什么成分？怎么看不懂？
另外，再问一个单词，字典上查不到。“effornal”。这个单词是什么意思？
谢谢

去年，该机构被称为联合国艾滋病规划署估计，有39个其中有350万人感染艾滋病毒。上周二，降低到36 ％ ，以略多于3300万。
39其中有350万

that [ðæt]
adj. 那; 那个
adv. 那么, 那样
conj. 因为, 由于; 为了, 以至于
that [ðæt]
pron. 那
a. pron. 那,那个
conj. 引导宾语从句
例句:
I reached the gate that opened onto the lake.
我走到临湖而开的那扇门前。
Bring it closer so that I may see it better.
把它拿近点儿，让我看看仔细。
He knows only that much.
他只知道那么多。
that
KK: []
DJ: []
pron.
1. 那;那个,那人,那事,那东西
That's my English teacher over there.
那边是我的英文老师。
2. (已被提到的)那个,那人,那事,那东西
Who told her that?
那是谁告诉她那件事的?
3. 前者
4. (用作关系代词的先行词)那,那个
What is that which you have just stuffed into the plastic cup?
你刚才塞在塑料杯里的是什么东西?
5. (代替句中名词,避免重复)
The output of steel this year has increased by 20% compared with that in 1992.
今年钢产量比一九九二年增长了百分之二十。
6. (用作关系代词,引导关系从句)
a.
1. 那,那个
That book isn't mine.
那本书不是我的。