关于speak of
问题描述：
关于speak of
Soon scientists,legislators,and UN representatives spoke of the Sahara's annual 6-km (4-mi) expansion,a spurious fact.
这个句子里边的speak
为什么a fact前边有个逗号,难道不是speak of的宾语吗?
答
speak of谈到,说起
a spurious fact作the Sahara's annual 6-km (4-mi) expansion 的同源宾语.