Zookeepers learned lesson painfully.

Meaning: This sentence is about zookeepers who gained valuable knowledge, but it came at a cost of experiencing some kind of pain or difficulty.

Choice of Words: Zookeepers are people who take care of animals in a zoo. Learned means to gain knowledge or understanding of something. Lesson is something that is taught or learned, especially a principle or rule of conduct. Painfully means causing or involving physical or mental suffering.

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