存在的问题 meaning in Chinese

open question
problem

It was a problem that has existed for a long time .
那是一个长期存在的问题。
Food for the field kitchens is a chronic problem .
供给随军食堂所需要的食品是个长期存在的问题。
Contamination is a continual worry even in the cleanest equipment and the most favourable experimental situation .
甚至在有最清洁的设备和最好的实验条件时，沾染也是一个始终存在的问题。
Strategies of developing enterprise e - commerce
企业开展电子商务存在的问题与对策
The problem and consideration on urban house diffusion
城市住宅扩张中存在的问题

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