see

call on, see, visit, drop in

这些动词或词组均含有“拜访，访问”之意。
call on: 社交上的正式用语，指无目的、礼节性的短暂拜访，访问者与被访问者之间一般只有社交或公务关系。
see: 常用词，含义广泛，既可指接受他人来访，又可指去访问他人。
visit: 正式用词，强调出于工作需要的访问，也指亲戚朋友间的看望。
drop in: 多指在计划之外或事先未打招呼的偶然、顺便访问。也可指参观。

look, see, watch, observe, witness

这些动词均有“看”之意。
look: 侧重“看”的动作。
see: 指看见。
watch: 指用眼睛跟随某物，以便对每一个变化、运动等进行观察。
observe: 侧重以客观的态度进行观察。
witness: 指当场看见，亲眼看见。

名词 see:

1. the seat within a bishop's diocese where his cathedral is located

动词 see:

1. perceive by sight or have the power to perceive by sight
2. perceive (an idea or situation) mentally
   同义词：understand, realize, realise
3. perceive or be contemporaneous with
   同义词：witness, find
4. imagine; conceive of; see in one's mind
   同义词：visualize, visualise, envision, project, fancy, figure, picture, image
5. deem to be
   同义词：consider, reckon, view, regard
6. get to know or become aware of, usually accidentally
   同义词：learn, hear, get word, get wind, pick up, find out, get a line, discover
7. see or watch
   同义词：watch, view, catch, take in
8. find out, learn, or determine with certainty, usually by making an inquiry or other effort
   同义词：determine, check, find out, ascertain, watch, learn
9. come together
   同义词：meet, run into, encounter, run across, come across
10. be careful or certain to do something; make certain of something
    同义词：check, insure, see to it, ensure, control, ascertain, assure
11. go to see for professional or business reasons
12. go to see for a social visit
13. visit a place, as for entertainment
    同义词：visit
14. take charge of or deal with
    同义词：attend, take care, look
15. receive as a specified guest
16. date regularly; have a steady relationship with
    同义词：go steady, go out, date
17. see and understand, have a good eye
18. deliberate or decide
19. observe as if with an eye
20. observe, check out, and look over carefully or inspect
    同义词：examine
21. go or live through
    同义词：experience, undergo, go through
22. accompany or escort
    同义词：escort
23. match or meet
24. make sense of; assign a meaning to
    同义词：interpret, construe

1. Move out of the way, please: I can't see through you!
   请借光，你挡著我就看不见了。
2. If you shut your eyes you can't see.
   要是把眼睛闭上就什麽也看不见了。
3. It was getting dark and I couldn't see to read.
   天渐渐黑了，我看不见字，无法再阅读了。
4. Do you see what I mean?
   你明白我的意思吗？
5. I looked for her in the crowd but couldn't see her.
   我在人群中寻找她，但看不到。