conformist
n
person who conforms to accepted behaviour, the established religion, etc 循规蹈矩的人; 墨守成规的人
She's too much of a conformist to wear silly clothes. 她很古板, 不穿那些奇装异服.
Those planning a trip to remote areas, or intending to live in countries where drinking water is not readily available, should know about the various possible methods for making water safe.