自信，微笑，表达肯定。

Have confidence, smile and show your interest to those around you.

youdao

原因是两个否定实际上互相抵消，表达肯定的含义。

The reason for this is that two negatives actually cancel each other out and create an affirmative statement.

youdao

汉语表达肯定命题的否定句式的实质是连用两次否定形式并表达一个肯定意义。

The essence of negative sentence pattern to express affirmative proposition is to link two negative forms together for a positive sense.

youdao

And this puzzle piece here colored in blue because it's a Boolean expression is just something that--whose answer is either a yes or no, 0 true or false, one or zero.

这个拼图染成蓝色,因为它是布尔表达式,它的结果只可能是肯定或否定，对或错，1或者。

哈佛公开课 - 计算机科学课程节选