Teaching off a blackboard is boring, and undoubtedly turns people off.是什么意思？

Teaching off a blackboard is boring, and undoubtedly turns people off.

照本宣科枯燥乏味，无疑会使人们丧失学习兴趣。

teaching

n. 教学，教义，所教的东西，学说；adj. 教学的，教导的；v. 教( teach的现在分词)，教书，训练，教育；

例句
The cure for bad teaching is good teachers, and good teachers cost money.
解决教学质量差的办法就是请好的教师，但请好的教师是需要花钱的。

off

prep. 从…落下，离开，从…去掉，下班；adv. 离开，距，离，被取消，下班；adj. 不新鲜的，不能接受，不礼

例句
He eased his foot off the accelerator.
他松开了油门。

blackboard

n. 黑板；

例句
There was a blackboard with seven names chalked on it.
黑板上用粉笔写着7个人名。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

boring

adj. 无聊的，无趣的，令人厌烦的，单调的，乏味的；n. 钻孔，钻屑；v. 令人厌烦(bore的现在分词)；

例句
Their work was taken up with boring and blasting rock with gelignite...
他们的工作是用葛里炸药炸石头，非常枯燥。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

undoubtedly

adv. 毋庸置疑地，的确地，显然，必定，无疑；

例句
Burke's sentiments undoubtedly struck a responsive chord in Parliament.
伯克的观点无疑引起了议会的积极回应。

turns

v. （使）转动( turn的第三人称单数 )，旋转，（使）改变方向，（使）不适；

例句
I want to work at home on a Tuesday but as it turns out sometimes it's a Wednesday or a Thursday.
我想周二在家工作，但实际上有时却是周三或是周四。

people

n. 人，人类，居民，人民，种族；vt. 居住于，布满，使住满人，在…殖民，把动物放养在；

例句
Most people have very little difficulty in seeing why a Van Gogh is a work of genius.
多数人不难理解为什么凡·高的作品是天才之作。