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abbr. 上下文无关文法；控制流图control flow graph
🗣️ 情景例句
No. Isn't it wonderful?
不， 这不是很美妙吗？
We should make it clear whether the damage was caused in transit or during the unloading process, or by other reasons.
我们要弄清楚货物是否在运输途中受损，还是在卸货过程中受损，或者别的原因。
You must always return your library book on time!
你必须按时归还图书馆的书！