英语翻译a state of being certain either that a hypothesis or pre

英语翻译
a state of being certain either that a hypothesis or prediction is correct
or that a chosen course of action is the best or most effective.
Self-confidence is having confidence in oneself
Voice qualities that contribute to your image:
Tone of voice
Rate of speech (tempo)
Volume
Ability to pronounce (diction)
How you move & carry yourself