Unfortunately, it is in thenatureofthe archaeological evidence, which is almost invariable only a sample of what once existed, that such figures will always be elusive.
Thenature and availability of material evidence was not to be discussed.
关键证据的性质和有效性将不予以讨论。
《柯林斯英汉双解大词典》
3
The scope and natureofthe problem is only beginning to be delineated, many risk factors remain contested, and the evidence for what works to prevent elder maltreatment is limited.