Due to this property of SQuAD, translating the triple (p, q, a) is non-trivial: when p and a are translated into target language, p t and a t , a t ⊆ p t may no longer hold.
we need to find the answer span a t in the target language, by matching with a s in the source language s. We overviewed a highprecision baseline  where a s and p s are independently translated, and a t is found only when the translation of a s is exactly and consecutively found in that of p s .