@Gustavo, Co-Moderator posted:
Hi, Robby zhu,
I find it contradictory. I find the classification provided by LDOCE clearer:
ne‧go‧ti‧a‧tion noun[countable usually plural, uncountable]
This means that the noun can be either countable (in which case it is usually found in the plural form) or uncountable.
Yes, its clearer. That "also" confuses me, but it is also from a reliable source：