7. Polly found herself staring up at a man standing with his hand resting on her arm.
波利意识到自己正抬头盯着一个男人，他站着，把手放在她的手臂上。
find oneself doing意识到自己不自觉在干某事。
find oneself in/at 意识到自己不自觉地处于某种（不好的）处境中。例如：
Peter, who was usually shy, found himself talking to the girls.
彼得，平时很害羞的他发现自己竟和这帮女孩搭起话来了。
If you find yourself worrying about things, call me.
如果你觉着自己老是担心就打电话给我。
After wandering around, we found ourselves back at the hotel.
四处徘徊后，我们竟然回到了旅馆。
Finding herself in the mire, Mary had to give up her adventure.
发现自己陷入困境后，玛丽不得不放弃她的冒险活动。
standing with his hand resting on her arm现在分词作定语，修饰a man。例如：
Houses near airports sometimes have their windows broken by the noise of jet planes passing overhead.
因为飞在上空的喷气式飞机的噪音的影响，靠近机场的房子有时候窗子会被震破。
The boy standing there is a classmate of mine.
站在那儿的男孩是我的同班同学。
句中with his hand resting on her arm是属于with + n. + 现在分词，分词作宾语补足语。作该句式的宾语补足语除了现在分词外，还可是过去分词，形容词，副词，不定式和介词短语。例如：
With the old man leading, the two started toward the mountains. （现在分词）
有这老人带路，这两人朝山上出发。
The child was crying with the cup broken. （现在分词）
因为杯子破了，小孩在哭。
He often sleeps with the window open. （形容词）
他经常开着窗子睡觉。
The building looks even more beautiful with all lights on. （副词）
这栋楼所有灯亮着时看起来更漂亮了。
With the boy to help us, we will soon find the place. （不定式）
有这个男孩帮我们，我们很快就会找到那地方。
The guard stood there with a gun in his hand. （介词短语）
警卫手里拿着枪站在那儿。
rest on 被搁在, 停留在, 信赖。例如：
Her hand rested lightly on his shoulder.
她的手轻轻搭在他的肩膀上。
The bridge rests on stone arches.
这座桥靠石拱支持。
His eyes rested on the peaceful valley below.
他的双眼凝视着下面的山谷。

8. The face that she saw was that of an old man.
她看到的是一张老年人的脸。
第二个that在句中用作代词，指代the face。that既可以指代不可数名词，也可指代可数名词，其复数形式是those。例如：
The effect teachers have on children are greater than that of parents.
老师对孩子的影响比家长对孩子的影响大。（that指代不可数名词）
The book I bought yesterday is more interesting than that he has.
我昨天买的书比他有的有趣得多。（that指代可数名词）
The most powerful words that sell are those that refer to the costs.
能促进销售的最有力的话是那些涉及成本的语言。
it与that的区别：
it指的是同一个事物，即同名同物，that所指代的名词和前面提到的名词是同一类，即同名异物。例如：
I like the car, but I have no money to buy it.
我喜欢那辆小轿车，但是我没钱买它。（it指的是 the car，指的是同一辆车）
The car I want to buy is more beautiful than that he has.
我想买的车要比他的车漂亮得多。（that指的是the car，不是the car I want to buy）
one与 that 的区别：
虽然one与that都可以指代前面同名异物的名词，但one指的是同类中的一个，属于泛指，相当于a/ an + 名词，而that属于特指，相当于the + 名词。One的复数形式是ones, that的复数形式是those例如：
Do you need my pen? No, thanks, I have got one. (one=a pen)
你要用我的笔吗？不，我有一支。
The bridge built of steel is stronger than that built of stone. (that= the bridge built of stone)
那座铁桥要比那座石桥牢固得多。
There are a lot of apples in the basket, please pick out the rotten ones.
篮子里有很多苹果，请把那些烂的捡出来。

9. Watch out for the step here.
当心这的台阶。
watch out for 戒备, 提防, 密切注意。例如：
Watch out for a tall man in a black hat.
密切注视一个戴黑帽的高个子男人。
You have to watch out for fast traffic along here.
你要小心这一带快速行驶的车辆。