Since she was indoors, she had not been wearing a coat...是什么意思？

Since she was indoors, she had not been wearing a coat...

由于她在室内,就没有穿外套。

since

prep. 从…以来，自从…之后，自从；adv. 以后，此后，后来，（距今几年）以前，（从那时候起几年）以前；conj. 自从…以来，自从…的时候起，既然，因为；

例句
Janet had been abused by her father since she was eleven.
珍妮特从11岁起就遭受父亲虐待。

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

indoors

adv. 在室内，在户内，在屋

例句
The crowd moved indoors for what were deemed the most desirable items.
人群为了被视为最值得拥有的物品涌入屋里。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

not

adv. 不，[用以表示否定、否认、拒绝、禁止等]不是，几乎不，未必，没有[用于否定后面的词或短语]；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

been

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去分词 ），在，存在，不受干扰，去过了，be的过去分词；

例句
Have you been able to have any kind of contact?...
你联系上了吗？

wearing

adj. 使人疲乏的，令人厌烦的；v. 穿着( wear的现在分词 )，磨成，使疲乏，同意；

例句
One of the boys had to be rescued by firemen wearing breathing apparatus.
其中一个男孩须由带着呼吸装置的消防员才能救出。

coat

n. 上衣，外套；vt. 给…穿上上衣[外套]，盖上；

例句
...a coat with an astrakhan collar.
羔羊皮领大衣