alone

adj. 独自的；单独的；孤独的

adv. 独自地；单独地

中文词源

alone 单独的

来自短语 all one .

alone: alone: [13] Although partly disguised by its pronunciation, alone is in fact simply a compound of all and one (whose /wun/ pronunciation began to develop around the 15th century). In Old English it was a completely separate phrase, all āna, literally ‘completely by oneself’, but by the 13th century this had coalesced into a single word. Loss of its initial ain the 14th century gave rise to the adjective lone.
=> all, lone, one
alone (adj., adv.): c. 1300 contraction of all ane, from Old English all ana "unaccompanied, all by oneself," from all "all, wholly" (see all) + an "one" (see one). Similar compounds are found in German (allein) and Dutch (alleen).

1. If you're lonely when you're alone, you're in bad company.--Jean Paul Sartre: 如果你独处时感到寂寞，说明没有把自己陪好。

2. Don't leave a child alone in a room with an open fire.: 房间里有裸露的明火时，不要让孩子独处其中。

3. He knew when to leave well alone and when to interfere.: 他知道什么时候该适可而止，什么时候该插手干预。