Question

write up 和write down 有何区别？

Answer 1

在“写东西”的意义上，“write”、“write down”和“write up”有着很大区别，不能相互替换。
1.       “Write something”：意为写的动作，对应的是没写的概念。如：
a)       Molière wrote his last play, The Imaginary Invalid, in 1673.
b)      I'm planning to write my essay on Molière's comedies next week.
2.       “Write something down”或“write down something”：意为写下备忘，强调具体内容，不很正式；对应的是默记的概念。如：
a)       I wrote down your number, but now I can't find it.
b)      You don't have to write everything down that the lecturer says.
3.       “Write something up”或“write up something”：意为完整清晰地记录，强调写作目标，相对正式；对应的是部分写完的概念。“Up”常用于强调完成，例如“chop up”就比“chop”彻底。如：a)       I'm going to write up my lecture notes this evening.
b)      Write your notes up while they're still fresh.
同一事物可用不同短语描述，但侧重点不同。在“Teen who was so ill she wrote a bucket list undergoes lifesaving double lung transplant”中，“list”本不必写，但她写了，强调的是写下遗愿这一事实。在“I’m going to write up an event by writing down a list of people who attended”中，“list”是写作素材之一，属于要记住的具体内容，“event”才是写作目标；而在“Set aside time to write up your gift list”中，“list”本身就是要完成的写作目标。
在其它意义上，“write down”和“write up”可以是反义词，比如“低估资产”和“高估资产”。

Answer 2

write up是整理 write down是写下