[jì yì lì]

mnemasthenia
記憶力薄弱

One's memory is failing.
記憶力衰退。

have a good memory
記憶力強

have a poor memory
記憶力弱

discipline the memory; exercise one's memory
鍛煉記憶力

improve one's memory
增強記憶力

lose one's memory
失去記憶力

I have a good memory so I learn more quickly than others.
我記憶力很好， 因此學起來比別人快一些。

Don't trust to your own memory too much.
不要過分相信自己的記憶力。