柯林斯高级英语学习词典中这样描述while的一种用法:
You use while, before making a statement, in order to introduce information that partly conflicts with your statement.
例句:While the numbers of such developments are relatively small, the potential market is
large...
While the news, so far, has been good, there may be days ahead when it is bad.
百度有个类似的解释
while:而,同时
even though 尽管/虽然
虽然都可用于表达转折,含义还是有很大的不同。while代表的是一种与前句不同的结果,比如jack picked that red shirt while michael picked the black one.(杰克拿了一件红色衬衫,而麦克拿了件黑色的) ;even though在这里是一种与前句应当出现结果相悖的情况,是一种真正意义上的转折,如jack picked the red shirt even thought he preferred that black one.(尽管杰克更喜欢那件黑色的,他还是拿了红色的)
总体来说,一是含义有区别,二是在句子中的位置不同,尽管都可以用在句中逗号前,while还可用于句首,这时就带有一种解释的意味(while jack picked the red one,michael had to pick the left black one.)
while和though引导让步状语从句时,语法意思上差不多,都表示“尽管,虽然”,但while的语气稍弱一些。
eg.
While I admit his goog points,I can see his shortingcomings.尽管我承认他的优点,我还看到他 的缺点。
Though (it was) cold,he still wore a shirt.天气虽然冷,他还穿着一件衬衫。
总而言之,个人感觉,while做“虽然”引导让步状语从句,描述的应当是同样的事情,可能可以理解为起码是同样的主语或者前后表达的主要对象一致。
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