She did not return his tentative smile.是什么意思？

She did not return his tentative smile.

她并没有对他怯生生的微笑作出回应。

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。

did

v. 做( do的过去式)，干，学习，研究；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

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。

return

v. 回来，退还，重现，回报；n. 回来，归还，恢复，利润；

例句
After completing and signing it, please return the form to us in the envelope provided.
填完表格并签名后，请装进所提供的信封里寄还给我们。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

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

tentative

adj. 试探性的，试验的，尝试性的，不确定的；n. 假设，实验，尝试；

例句
Political leaders have reached a tentative agreement to hold a preparatory conference next month...
政治领导人已就下个月举行预备会议达成初步协定。

smile

n. 微笑，笑容；vt. 以微笑表示，以微笑完成；vi. 微笑，赞许，不在乎；

例句
He answered her smile with one of his own...
他对她的微笑回以同礼。