as to造句

Medical authorities were baffled, both as to its causes and its virulence.
医疗当局对其病因及有多致命都还不甚了解。

How can faculty improve their teaching so as to encourage creativity?
教师们如何才能改进教学以激发创造性呢？

He is in no doubt as to what is needed.
他很确定需要什么。