记忆深刻叫我怎忘记
[jì yì shēn kè jiào wŏ zĕn wàng jì]
It expresses the feeling of someone who has an unforgettable memory, deeply engraved in their mind that they cannot forget. The depth and vividness of the memory are emphasized, implying that such remembrance might be due to significant emotional events or profound impressions left by others.