看来是韦氏错了。

以下是从一网站摘来的：
I, and everyone else I know, pronounce hot and dog with different vowel sounds. This includes people from Indiana, Wisconsin, and Michigan.

Hot I pronounce with the ah sound, and dog with the aw sound. Now people from the East Coast and in areas of Canada, pronounce hot and many other words with more of the aw sound.

结论是，东岸的一些人发HOT用not里的O，其他地方用“啊”。

所有跟帖： 

• 同意这看法. 就是各地口音不同.不必过分考究 -suvescape- ♂ (0 bytes) () 10/20/2009 postreply 20:52:17

• 我在加拿大读ESL的时候,老师特别交代不要用韦氏字典,要用longman! -suvescape- ♂ (223 bytes) () 10/21/2009 postreply 11:16:18