一个可能的原因是，有些人由于从三角肌清除铝的能力受损而形成易感体质。
A plausible possibility is the existence of a predisposed subset of individuals with impaired ability to clear aluminium from the deltoid muscle.
有一些人的体质容易受感染，对他们来说这种病症可能会由于吸烟、服用特定药物、压力过大和其他原因而加剧。
Some people are genetically susceptible, and the problem can be aggravated by smoking, taking certain medications, stress and other factors.
结果表明，常规组分以及微量组分中的氟、锰、铁等原生组分超标是造成天津市地下水水质总体质量较差的主要原因。
The results are that, the conventional component and the micro component as well as fluoride, manganese, iron exceed is main reason of bad. quality of groundwater.
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