Lonely
adj. 孤獨的, 寂寞的，荒涼的, 人跡罕至的
It describes a feeling of sadness stemming from isolation or abandonment.
它用來來形容一種因孤獨或被遺棄而產(chǎn)生的悲傷情緒。
例：
The lonely old man was much to be pitied by all of us.
那位孤獨的老人得到了我們大家的同情。
A person can be alone without feeling lonely, since alone describes a state of being and lonely describes an emotional response to one’s circumstances. Most people don’t feel sad when they go to the bathroom by themselves, for instance.
一個人可以alone而不感到lonely，因為alone是一種狀態(tài)，而lonely是對一個人處境的一種情感反應。例如，大多數(shù)人獨自上廁所時并不感到悲傷。
Alone
adj. 單獨的；孤獨的；獨自的
adv. 獨自地；單獨地
It describes a single person or object, separate from others. One who is alone is by oneself.
它形容一個單獨的人或物體，與其他個體分離的狀態(tài)。如果一個人是alone的，就是說他/她只有自己。
例：
She went to the movies alone, because her friends talked too much.
她獨自去看電影，因為她的朋友話太多了。
Emma realized that she was alone in the desert.
艾瑪意識到沙漠里只有她一個人。
As you can see, a person can be alone in the sense that no other people are present, or alone in the sense that he or she is unaccompanied, even in a crowd.
一個人可以是其他人不在場的時候alone，也可以是沒有人陪伴的時候alone，即使是在人群中。
最后總結(jié)一下
? Alone describes a state of isolation or solitude when one is outside the company of others.
Alone指一個人在沒有其他人陪伴的情況下，處于一種孤立或孤獨的狀態(tài)
? Lonely describes a feeling of sadness or abandonment.
Lonely是一種悲傷或被遺棄的感覺。
Loneliness is often, but not always, a result of being alone.
孤獨（Loneliness）往往是獨處（alone）的結(jié)果，但也并不總是如此。
