what's the first thing that that tells you about this author?

这首先说明了作者的什么
He's not an eyewitness, precisely.

他不是亲眼看见的
"I, too, decided, after investigating everything

"这些事我既从起头都详细考察了
carefully from the very first, to write an orderly account" there again

就定意要按着次序写给你" 又是这词
"for you, most excellent Theopholis, so that you may know the truth

"使你知道所学之道
concerning the things about which you have been instructed.

都是确实的"
There are several things that

这段路加福音福音的序言
this prologue to the Gospel of luke tells us.

告诉我们几点
One of the things of course, as you just noticed,

其中一点你们应该发现了
it's not written by someone who was there.

它不是由目击者写的
Some people will say that when we get to Acts,

有些人会说使徒行传
at least part of Acts seems to have been written by a person

至少有一部分看起来像是