then的用法Before Dr.Luther L.Terry,then the Surgeon General of the United States,issued his office’s first "Report on Smoking and Health" more than 30 years ago,thousands of articles had already been written on the effects of tobacco use on the

then的用法Before Dr.Luther L.Terry,then the Surgeon General of the United States,issued his office’s first "Report on Smoking and Health" more than 30 years ago,thousands of articles had already been written on the effects of tobacco use on the
then的用法
Before Dr.Luther L.Terry,then the Surgeon General of the United States,issued his office’s first "Report on Smoking and Health" more than 30 years ago,thousands of articles had already been written on the effects of tobacco use on the human body.
请问上句中then是什么用法,我看不懂,觉得好像多余了

then的用法Before Dr.Luther L.Terry,then the Surgeon General of the United States,issued his office’s first "Report on Smoking and Health" more than 30 years ago,thousands of articles had already been written on the effects of tobacco use on the
then 在此是副词.意思是然后,于是,接着.一是表示时间上的先后,二是使句子更连贯.

then
[Ten]
adv.
当时, 在那时, 那么, 因而, 然后, 于是
then
[Ten]
adv.
[指过去]当时; [指将来]到那时
然后, 于是, 接着
[常用于句首或句尾]那么, 而且, 另外, 再者
[与now, sometimes等连用](一会儿...)一会儿
I was still un...

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then
[Ten]
adv.
当时, 在那时, 那么, 因而, 然后, 于是
then
[Ten]
adv.
[指过去]当时; [指将来]到那时
然后, 于是, 接着
[常用于句首或句尾]那么, 而且, 另外, 再者
[与now, sometimes等连用](一会儿...)一会儿
I was still unmarried then.
当时我还没有结婚。
We had a week in Shanghai and then went to Beijing.
我们在上海住了一个星期然后前往北京。
T-let's go.
那么, 咱们走吧!
T-don't forget to bring me the book you promised.
另外,别忘了把你答应借给我的书带来。
Now the weather is fine, then nasty.
天气一会儿好, 一会儿坏。
then
[Ten]
conj.
[前面常用and]此外
And then, you must remember...
此外, 你必须记住...
then
[Ten]
adj.
当时的
the then president
当时的总统
then
[Ten]
n.
[作介词的宾语]那时
before then
那时以前
but then
但是, 但是另一方面
by then
到那时候
from then on
从那时起
now then
(抗议; 警告, 唤起注意时)可是; 喂!
now and then
间或; 时时; 不时地
since then
那时以来
till then
一直到那时, 到那时为止
well, then
既然如此
what then
下步怎么办; 那便会怎么样呢?
then and not till then
那时候才开始
thenand there(=there andthen)
当时, 当场

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then 是一个副词,意思是然后, 于是, 接着。一是表示时间上的先后，二是使句子更连贯。
不要将then和than混淆了
than是超过的意思