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abbr. 上下文无关文法；控制流图control flow graph
🗣️ 情景例句
Couldn't you sell us one carton for-?
不能以每盒--卖给我们吗？
Yes, we have done a little. But we have just started and have nothing to show you.
有，我们做了一些，但是因为我们才刚起步，并没有任何资料可以提供给你们。
Please push the ladder against the wall.
请把梯子靠在墙壁上。