adjective
1 [before noun] almost a particular thing or quality:
例句：Ten years of incompetent government had brought about the virtual collapse of the country's economy.
War in the region now looks like a virtual certainty.
2 describes something that can be done or seen using a computer and therefore without going anywhere or talking to anyone:
例句：virtual shopping/banking
virtually /?v?.tju.?.li/ US /?v?-/
adverb
almost:
例句Their twins are virtually identical.
That wine stain on my shirt has virtually disappeared.
讓我們看看這個劍橋高階詞典上的解釋吧！英英詞典才是學英語的至寶！
下面請看我的翻譯和分析
1.adjective，[before noun] almost a particular thing or quality。
形容詞，用在名字前面，做前置定語，這裏的意思是指“壹個特定的事物或是品質！”，對應中文意思的“真實的”
2 describes something that can be done or seen using a computer and therefore without going anywhere or talking to anyone
這裏是指壹件可以用電腦完成，而且不用去任何其他地方就能完成的事情，這是例子，virtual shopping/banking，中文是“（虛擬的)網絡購物，（虛擬的）網上銀行”，這裏對應中文意思的“虛擬”，也可以說網絡那方面的東西，如“虛擬世界（網絡世界，與真實世界相對應）”
adverb
almost，還有壹個意思就是用作副詞，做“大概，幾乎”的意思！這個副詞詞性是不經常用的！
學英語的話，到了壹定程度，最好還是弄壹本英英詞典！這樣會幫助很大的！
希望可以幫到您！