if not

1. 1.

   Indicates that a statement is true in the event that a condition is not satisfied.

   表示在条件不满足时,所述情况依然成立。

2. 2.

   Indicates that one statement at least is true, and possibly a second, stronger statement is true; perhaps even.

   表示至少有一种情况属实,且可能第二种更强的情况也属实；甚至可能。

3. 3.

   Indicates that one statement is true, but a second is not; but not.

   表示一个陈述为真,但另一个为假；而不是。

表示至少有一种情况属实,且可能第二种更强的情况也属实；甚至可能。；表示一个陈述为真,但另一个为假；而不是。