as- (to, towards) + cert (sure, certain) + -ain (verb suffix)。 ascertain v.查明,確定 ( 由事實查明,如通過檢查或試驗 )
【例】We must ascertain the usual customs of the local people.
我們必須瞭解當地人民的風俗習慣。
【根】as朝向,certain肯定的→朝向肯定→確定
as (當做) + certain (確定) → ascertain 確定
We need to ascertain what the problem is so that we can fix it.