a.

1. 单独的，独自的[F]
   She watches TV when she is alone.

   独自一人时，她便看电视。

2. 只有，仅；单单[A]
   The rent alone is $300.

   单房租就三百元。

ad.

1. 单独地
   For years Mary lived alone in New York.

   玛丽孤身一人在纽约生活了好几年。

2. 独自地
   I can do it alone.

   我可以独自办理此事。

adj.

adv.

1. on one's own; by oneself.
   ▸isolated and lonely.
2. only; exclusively.