星际战甲元素卡掉落:“一封200字的信”用英语怎么说？

a two-hundred-word letter
a letter of two hundred words
都可以

two-hundred-word 是形容词，作定语修饰letter，意为”两百字的”
英语中表所属时，若名词为有生命的，则直接加”`s”，如Peter`s book(彼得的书”；若名词为无生命的，则用连接，如the window of the world（世界之窗）

two hundred 表示”两百”，是复数，所以word 要加s

a two-hundred-words letter
word
n
词，单词；话，言语
Not all women like the word Ms.
并非所有的女性都喜欢Ms.这个词。
Words failed me.; My tongue failed me.
我激动得讲不出话来。
Tell me in your own words.
用你自己的话告诉我。
Home is the word for the place we live.
家这个词的意思是指我们住的地方。
简短的话，几句话
'I can't hear a word!' I said angrily.
'我一句也听不见了!'我愤怒地说。
Can I have a word with you?
我能和你说几句话吗？
消息
No word has come from the battle front.
前线还没有消息传来。
〈计〉字
承诺
I give you my word that I will return.
我向你保证我会回来的。
The boy kept his word.
那孩子信守诺言。

word为可数名词

a letter with two hundred words

a letter which have 200 hundred words

a 200-word letter

A letter of 200 words letter