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运筹学
🗣️ 情景例句
I'm sorry, I really don't know.
对不起，我真的不知道。
The chances for a promotion look really good, but before I get too old I want to see the world.
提升的机会确实无可挑剔，但是在我变得太老之前，我想去看看世界。
They cut big pieces of metal into small pieces.
它们把大块的金属切成小块。