在纸上，以书面形式：指将某事写下来。
仅在理论上，仅从表面上看：指某事在书面信息中看起来是真实或可能的，但实际情况可能不同。
as written or printed
同义词： in writing
as described in contrast to as practiced
同义词： in theory
according to the assumed facts
同义词： theoretically / in theory
... Your English paper is due.你的英语课作业该缴了。 on paper理论上的；未经实践考验的 This plan seem good on paper.这个计划在理论上似乎很好。 ...
... n.纸;论文;文件;报纸 , adj.纸做的 , vt.用纸糊;用纸包装 , vi.贴糊墙纸;发交通违章传票 on paper以书面形式;在名义上 paper industry造纸工业 ...
... Houses are more expensive down south. 南边的房屋价格要贵些。 on paper; on a list （写）在纸上；（列）在表格上 Did you get that down? 你写下来了吗？ ...
... Your English paper is due.你的英语课作业该缴了。 on paper理论上的；未经实践考验的 This plan seem good on paper.这个计划在理论上似乎很好。 ...
It is important to get something down on paper.
重要的是要把一些事情写在纸上。
Ferris has a rare ability to record her observations on paper.
费里斯有将自己的观察结果以书面形式记录下来的杰出能力。
I poured my thoughts out on paper in an attempt to rationalize my feelings.
我将自己的想法倒出，写在纸上以求理顺情绪。
Once they find the name, many rub a pencil on paper over the letters to copy it.
VOA : special.2009.05.25
She was noting that lawyers look at human rights law and they say "It's on paper. It's good. It's there."
她跟我说,律师们对于关于人权法的看法是,“这已经立法，在法律上有了一席之地，这很好，“
人性课程节选 : 普林斯顿公开课
Sometimes I write my feelings down on paper to release stress.
有时我会把我的感受写在一张纸上来释放压力。
SpeakingMax英语口语达人 : Why don't 实战
And sixty percent felt they read more when they were reading on paper.
VOA : special.2009.09.03
He says he likes the cleanliness of ink drawing on paper.
VOA : special.2009.09.02
The work, drawn by Garth Montgomery Williams in 1952, is graphite and ink on paper.
Yet it seems that what matters in court is what ends up on paper.
Techs and Greens will probably be attracted to the CODA Sedan, at least on paper.
FORBES: 2012 CODA Sedan -- Changing Perceptions Of All-Electric