underlie (-lying: past -lay: past participle -lain)
[with obj.](especially of a layer of rock or soil) lie or be situated under (something) (尤指岩石,土壤)位于…之下 ■be the cause or basis of (something) 引起(某事);构成基础(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。
语源
Old English underlicgan 'be subject or subordinate to' (see under-, lie)