问题 say的用法疑问（前后有逗号）

And the full economic benefits created by a road, say, are not captured by the organization paying for it.这里的say是什么用法?

话题 not-good-enough

话题 not...so much as

话题 Not more than；help

话题 not so much as

话题 I know not sth

话题 could not but see

话题 not only...but also

话题 not much more than

话题 if not more so

话题 not only...but also...

话题 last but not least

话题 not A or B

话题 not just but also

话题 to not do sth