Useful-life
n. 有效期限\\n[计] 有效期限
🧩 词语组成解析
life
[laɪf]
n. 生活，生计;生命，性命;一生，寿命;人生，尘世;
🗣️ 情景例句
Uh, it must mean something.
噢 ，这很有意思。
Me too. I was hoping we could go to the beach today, but it looks like that's out of the question.
我也这么想，我本来希望我们今天去海边，但看来没戏了。
Suddenly, they heard a voice behind them.
突然他们听到身后有声音。