Positivity
n. 確實, 確信, 肯定性
??? 情景例句
Good-bye.
再見。
I do not know whether you realize it, but this condition is essential to us.
我不知道你是否了解，但是，這個條件對我們是必要的。
A planet would have to be a very long way from it to be capable of supporting life.
那么一顆行星為了維持生命就要離開的它的恒星非常遠。