Nonreversibility
不可逆性
??? 情景例句
Hey, you know? There's still some film left on this roll,
嘿 ，知道嗎？ 這一張 ，還有一些底片，
Count not your chickens before they are hatched.
不要過早樂觀。
Yet this is not always the case.
但情況卻并不總是這樣。