What does 牢记 mean?

牢记
to keep firmly in mind; to remember well
Its characters
- 牢 firm
- 记 to remember
In a sentence
请牢记你的密码。 Please remember your password well.
More words with 牢 or 记
Keep 牢记 for Review
A free account keeps it, and Review brings it back just before you’d forget it.
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