USCIS关于Contribution的论证要求如下：
a.Objective documentary evidence of the significance of the beneficiary’s
contribution to the field;
b.Documentary evidence that people throughout the field currently consider
the beneficiary’s work important;
c. Testimony and/or support letters from experts which discuss the
beneficiary’s contributions of major significance;
d.Evidence that the beneficiary’s major significant contribution(s) has
provoked widespread public commentary in the field or has been widely cited;
e.Evidence of the beneficiary’s work being implemented by others.
这里边出现了三个意思相近又表述不同的话：d,e里是evidence，b里是Documentary
Evidence，a里是Objective documentary evidence。
这三者有哪些微妙或本质的区别吗？盼详解！
