For a sensible man, a word, a look, every act and every move, a change of tone, can be seen in one of the class nature and habits.

对于一个识相的人，一言一语，一举一动，一个眼神，一件声调的变化，都可以看出一个人的阶级本性和习惯。

youdao

"A sound that can create a change", is one of the original meanings of the word.

“可以创造变化的一个声音”，是这个词语的本意。

youdao

And then the presen- tation is treated as if it were the Gospel and to change one word of it would be a sacrilege.

FORBES: How can I find out if my presentation works? -Presentation Training