回复：我跟我教授讨论我的presentation, 他说问题不在

Contents and the way of delivering are keys.
Be assertive and confident since you are the MASTER with what you want to present.

Good voice projection, eye contact, and body language
Nice pace and pause.

Finally, make sure what masseges you want to your audience taking home.

Another important skill is how to handle questions ...

These are basic skills for making a good presentation.

Presentation is one of Communication skills.

Reading NCEs and other materials here is simply studying Language.. they are completely different.