nevertheless, nonetheless 的用法

Question

我的理解是这样的，nevertheless= nonetheless 有逗号隔开时他们等于 although， though。 没有逗号隔开 在句中时 等于 still。 不知理解对不对，请大神赐教。

Answer 1

两个都可以作副词，这时两个可以互换。 但nevertheless还可以作连词，也就说后面能够直接接一个句子，但nonetheless只是副词，必须用逗号与后面的句子分开，而且前面的句子后是句号而不是逗号。如：
The policeman told them to leave, nevertheless they seemed not to hear.
The policeman told them to leave. Nonetheless they seemed not to hear.

Answer 2

nevertheless 然而 ,不过
例：
Nevertheless, there are stirrings of change in latin america.
不过,南美也正在发生改变.
Nevertheless, his rousing availed him nothing.
然而站起来也于事无补.
nonetheless 尽管如此,但是
例：
Nonetheless, I think it's probably right.
尽管如此,我还是觉得它是有理的.
=Nevertheless; however.
仍然；不过追问

也就是说我的理解基本正确吗？