您要查找的是不是：
- Because Null represents an unknown value, the result of any comparison with Null is also unknown. 由于Null表示未知值,因此与Null进行的任何比较的结果也是未知的。
- NULL is a special value in databases that represents the concept of an unknown value. 在数据库中,NULL是一个特殊值,表示未知值的概念。
- If ANSI_NULLS is set to ON, the result is NULL, following the ANSI convention that a NULL (or unknown) value is not equal to another NULL or unknown value. 如果ANSI_NULLS设置为ON,则根据ANSI有关一个NULL(或未知)值与另一个NULL或未知值不相等的约定,结果为NULL。
- If it is a type parameter, then we know that the parameter represents an as yet unknown type.If it is a nontype parameter, we know it is an as yet unknown value. 如果是类型形参，我们就知道该形参表示未知类型，如果是非类型形参，我们就知道它是一个未知值。
- A quantity of unknown numerical value. 未知数数值不明的一个数量
- The leading role is played by a complete unknown. 演主角的是一个毫无名气的演员。
- A little crack detracts from the value of the vase. 小小的裂痕减损那个花瓶的价值。
- The star of the film is a previously unknown actor. 这部电影里的明星以前是个默默无闻的演员。
- Its greater part is unknown to me. 它的大部分对我是未知的。
- I set a high value on his advice. 我认为他的忠告很有价值。
- He was an unknown painter one year ago. 一年前，他还是一个不为人知的画家。
- The value of your assistance is inestimable. 阁下鼎立相助之功不可胜言。
- This is a fact hitherto unknown. 这是一个至今无人知道的事实。
- Kate is in bad with Lucy for some unknown reason. 因为某些不为人知的原因，凯特和露西关系不好。
- I am doubtful about the value of your proposal. 我怀疑你的提议是否有价值。
- We use x as the symbol for an unknown quantity. 我们用x表示一个未知数。
- I can take nothing you say at face value. 我不会把你说的话当真的。
- It is no safe wading in an unknown water. 不知水深浅，涉水不安全。
- The experience gained will be of great value to us. 所取得的经验对我们有很大价值。
- The investigation was tabled for reasons unknown. 不知何故调查延缓进行。
