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[ˈɔ:lsəu]

adv. 也,同样,并且  

来源于后期古英语all(精确地,准确地)和swa(因此)的复合词,语义是“就这样,因此,相似地”。

例:
You'll have to get a passport, and you'll also need a visa. 你必须申办护照, 同时还需要有签证。 
I am also writing a short story. 我也写短篇小说。 
The son has gone also. 儿子也去了。 
She not only plays well, but also writes music. 她不仅很会演奏, 而且还会作曲。