yet 放在句首代表什麼意思?

Yet studies show that crying sometimes makes people feel worse.
然而研究結果顯示有時候哭反而會讓人情緒感到更差。

Yet在這是連接詞。有"可是,卻,然而"的意思。
例如: I don't know him, yet I can get his help. 我不認識他,但我會得到他的幫助。
為什麼會加yet呢?由此句推論，完整段落中應該有說到哭可能是件好事，有可能被認為是好是，但研究結果顯示的竟然是不一樣的方向。所以才要用 yet轉折語氣。

As part of that study, three thousand people in different countries, mostly college students, wrote about recent crying experiences.
有是這研究的一部分，三千人從不同的國家中選出，其中大部分是大學生，寫下了它們最近的哭的經驗。

Most是形容詞 ( many, much; more; most) ( many , much 的最高級)最多的;最高程度的
Mostly是副詞。指的是"大多數地,大部分地;主要地"

你的句中，mostly college students，只的是"主要"的意思"。
而且，mostly是來修飾抽樣族群的次族群 - which is college students, mostly. 所以跟敘述最高級的most是完全不同的意思。

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希望有幫到你喔~

2009-02-01 16:20:28 補充：
Three thousand people in different countries mostly college students 這段化把它改為完整句子。

Three thousand people in different countries (are) mostly college students.

再把補語拿掉

Three thousand people are mostly college students.

這裡mostly指的是大多數
若用most則不合語意

希望你更了解喔！

這邊的mostly college students為何不用most?? 為何能用mostly副詞來修飾???

mostly is not used to modify "college students". It is used to modify the phrase "three thousand people in different countries", meaning most of them are college students.

2009-01-30 16:11:48 補充：
If you want to change it to "most college students", your sentence has to change to:
As part of that study, most college students wrote about recent crying experiences.

Yet studies show that crying sometimes makes people feel worse.
然而研究顯示哭(流淚)有時會令人們感到更糟
Yet ---> 有轉換語氣作用

As part of that study, three thousand people in different countries, mostly college students, wrote about recent crying experiences.

"mostly college students" 算是補助形容 "three thousand people in different countries" 單字本身來說就有不同, most - 最多, mostly - 大多數