How do I know when the listeners are bored and inattentive?

Failing to give due heed , care, or attention ; inattentive.

由于没有兴趣而缺乏注意力的.

inattentive to the needs of others

漠视他人的需要

He is smart but inattentive, he sometimes fails to concentrate when he is studying.

他虽然聪明但不够专心, 学习中时常心有旁骛.

I was not inattentive to inanimate nature, nor unmindful of the past.

对无生命的自然我并非不关心,对过去我也并非不留意.

Julia is an inattentive pupil.

朱莉亚是个不专心的学生.

She is inattentive to her guests.

她对客人招待不周.

He pretended not to notice that Mildred was inattentive.

他装出一付没有注意到米尔锥心不在焉的样子.

Thoug he seemed to listen carefully, he was inattentive and misapprehensive.

他好像是在注意听, 但却漫不经心,会错了意.

An inattentive pupil is unnecessarily an unclever boy or a girl.

不专心的学生不一定就是一个不聪明的孩子.

My teachers would send notes to my house telling Mum that I had inattentive.

老师就会把便条寄到我家,告诉妈妈我上课不专心.

In class, Rufus inattentive, angry, and unresponsive.

在班里, 鲁弗斯总是漫不经心, 暴躁易怒, 或是反应迟钝.

Leta, almost asleep, murmured something inaudible.

莉塔睡意朦胧, 咕咕哝哝地说了些模糊不清的话.

They are inaudible from the ground and can identify targets five miles away.

在地面里听不到它们的任何声音,它们能够辨认5英里以外的目标.

She whimpered something inaudible.

她呜咽着说了些什么，听不清。

Soon, the cast members were inaudible and the entire program was cancelled.

很快, 由于台下听不到台上的演员的声音,其它的节目也不得不连着一起取消了.

MR. WOOD: I think we have a question from ( inaudible ). Please.

伍德先生: 下一个问题来自 ( 声音不清 ). 请提问.

The man fell down, and let out an almost inaudible moan.

这个男的摔倒了, 发出了一声极其微弱的呻吟.

The little girl dropped her aunt a clumsy curtsey, murmuring an inaudible greeting.

小姑娘向她的姑妈笨拙地行了一个礼, 喃喃地说了几句听不见的问候话.

Zhao Liang is original inaudible can not wish he knows.

赵良本来听不见可不愿他知道.

Laozhang: Hello, who are you, I what is how inaudible.

老张: 喂喂, 你是谁, 我怎么什么都听不见.