is not Mrs. Watts; he sees a large, white knee.

不是沃特女士他所看见的是一个巨大的白色的膝盖
We saw a version of this also in the passage I was reading just before,

在我之前读的那一部分我们也看见了类似的这样一种景象
where "a hand" comes in the window and rests--"lands"--on

车窗户中一只手接着停留着陆
Haze's shoulder. "A square, red face."

在莫茨的肩膀上一个方形的红色的脸
And then these things, these body parts, are then referred

接下来这些东西这些身体部位都被
to with the pronoun "it"; "it," the hand, did this or that.

代词它给指代了它手指代这个或者指代那个
Take a look at page 18.

翻到第18页
This is Mrs. Hitchcock in the train; it's Haze bumping into

这位是在火车上的希奇科克女士莫茨撞到了希奇科克女士
Mrs. Hitchcock: Going around the corner,

刚转过这个弯
he ran in to something heavy and pink.

他就撞上了某种厚重的粉红色的东西
It gasped and muttered, "Clumsy."

它喘着粗气喃喃自语道笨手笨脚
It was Mrs. Hitchcock in a pink wrapper with her hair in

那是希奇科克女士她穿着件粉色的睡衣把满头