來自柯林斯詞典：
You use while, before making a statement, in order to introduce information that partly conflicts with your statement. 雖然 (用於發表陳述之前，引入和陳述內容部分矛盾的信息)
While the news, so far, has been good, there may be days ahead when it is bad.
雖然到目前為止都是好消息，但是可能過幾天就有壞消息了。