To stop a problem you have to understand its underlying causes.要想杜绝问题的发生, 必须弄清根本原因。

I think that the underlying problem is education, unemployment and bad housing.我认为深层的问题在于教育、失业和糟糕的住房条件。

hills with the hard underlying rock poking through the turf坚硬的下层岩石透过草皮形成的山丘

Cars were covered with clear-coat finish to protect the underlying paint from fading.汽车都涂了一层透明罩漆, 以防底漆褪色。