忘性不错其实就是记性不好的意思呀，呵呵。
1. have a short memory
have a short memory 记性不好
2. have a mind like a sieve
have a mind like a sieve 记性不好...
have a mind like a steel trap 记性极好
3. a short memory
a short memory 记性不好...
4. my roommate has a very short memory
eg. My roommate has a very short memory (记性不好)
最简单说就是forget things easily....要看前后文.
其他答案都可以的。
很简单：have/has terrible forgetfulness
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