underlie
/ˌʌndəˈlaɪ/verb
(-lying;past -lay;past participle -lain /-ˈleɪn/)with obj.
1- (especially of a layer of rock or soil) lie or be situated under (something)（尤指岩石、土壤）位于…之下。
1.1
- be the cause or basis of (something)引起（某事）; 构成…的基础（或起因）：
the fundamental issue which underlies the conflict.
引起冲突的基本争议
as adj. underlying the underlying causes of poverty and drug addiction.贫穷和吸毒的根本原因。
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