He had not a peg to hang on and got dumb for some time.

"他一点借口也找不出来,楞在那儿好一会儿。"

Deaf people and dumb people are disabled too.

聋人和人都是残疾人。

Never inflict useless pain on dumb animals.

切勿给不会说话的动物施加无谓的痛苦。

It was dumb of you to say that.

你说这种话太愚蠢了。

It was dumb of him to say yes.

他说“是”是愚蠢的。

He is dumb on the subject.

他对这个问题表示沉默。

They remained dumb at the meeting.

他们在会上保持沉默。

He is handsome,but a dumb cluck.

他很英俊,却是个傻瓜。

I acted dumb at first.

我开始有意沉默。

Enhancement brachium tricep and deltoid muscle: Lying face downward, right hand griping dumb bells and raising up.

增强肱三头肌和三角肌：俯卧，右手握住铃上举。

Contrariwise, if you suspect your question is too dumb for a mailing list, it's not an excuse to harass individual developers.

反之，如果你自认为你的问题太蠢，那也不值得你打扰任何一位开发成员。