人生有两出悲剧。一是万念俱灰；另一是踌躇满志。
There are two tragedy in life. One is the apathy; The other is hopeful.
对灰数的完整描述，必须确定出其灰域及可能度模型；
To describe grey number completely, we have to determine its grey field and possibility degree model.
⊙、人生有两出悲剧：一是万念俱灰，另一是踌躇满志。
There are two tragedy in life: one is desperation, the other is hopeful.
⊙、人生有两出悲剧：一是万念俱灰，另一是踌躇满志。
There are two tragedy in life: one is desperation, the other is hopeful.
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