在英语中，"主持"的意思是主持会议或活动的人。如果你想表达 "主持是傻子" 的意思，可以使用下列表达方式:

The host is an idiot. (主持人是个傻瓜。)

The host is a fool. (主持人是个傻子。)

The host is a dimwit. (主持人是个蒻。)

这些表达方式都是比较委婉的，但是在英语中，较为粗鲁的表达方式也常常使用，例如:

The host is a moron. (主持人是个蒙。)

The host is a imbecile. (主持人是个白痴。)

The host is a dunce. (主持人是个笨蛋。)

但是请注意，这些表达方式都是较为不礼貌的，并不适合在正式的场合使用。

下面是一些例句:

The host kept making mistakes and it was clear that he was an idiot. (主持人不断犯错，显然他是个傻瓜。)
I can't bepeve they hired a fool pke that to host the event. (真不敢相信他们竟然把那么个傻子做主持人。)
The host was a dimwit and kept forgetting people's names. (主持人是个蒻，不断忘记别人的名字。)
The host was a moron and kept making inappropriate jokes. (主持人是个蒙，不断说不恰当的笑话。)
I couldn't stand the host's imbecipc behavior. (我受不了主持人那种白痴般的行为。)
The host was a dunce and couldn't even get the order of the speeches right. (主持人是个笨蛋，甚至连演讲顺序都弄错了。)