Questions about example sentences with, and the definition and usage of "Effectiveness"

A: As deepfake celebrities endorsing products become more common, the effectiveness of real celebrity endorsements will decrease because people will become accustomed to seeing manipulated celebrities promoting various things.

A: It means how well something is done. You can use the word to describe a person or object

A: Sự hiệu quả
The effectiveness of this system is you're are not scare of being tracked any more

A: Lasting effectiveness

A: Some important antibiotics are losing their effectiveness due to overuse.

A: Effectiveness is how well something works.

Efficiency is more of how well something performs without waste.

Examples:
The antidote’s effectiveness was proven by the 100% survival rate in mice.

The worker was fired based on his poor efficiency; he rarely made mistakes but it took him hours to complete one assignment.

A: The first sentence, using effectiveness, doesn't really feel natural. Effectiveness refers to the ability to do a job, in this case, how well it numbs pain. The second sentence is much more natural, meaning the anesthesia takes a long time to work.

A: @Tomo97:
The effectiveness of the car's brakes was tested at high speed.
A reduced fever was the effect of the medicine.

A: Effectiveness comes from the word "effect".
Efficiency* comes from the word "efficient" they have very different meanings.
Effect is 效果.
对不起我不知道 "efficiency" 的华文翻译。

A: when you’re speaking, it’s good to avoid long words, and use as few words as you can. I would say

“I was wondering whether it would be better to learn new words from the New York Times or vocabulary textbooks.”

A: Perfect - very, very formal though.

A: So Good 😳

A: Unfortunately, the effectiveness greatly depends on the skills of a specialist who can perform the examination and interpret the picture. (Do you mean x-ray?)

A: 'Evaluate' may be more common