yes, "master of oratory" means that president obama is very good at public speaking.
I think you are referring to "oratory"-- this is an old word for public speaking. A person who is a "master" of oratory is considered an excellent public speaker, and even those who don't agree with the president believe he speaks very well. So yes, it would be true that he is a master of oratory.
The correct phrase is "introduction to the guest speaker." This phrase indicates that the speaker is being introduced to the audience. "Intro of the guest speaker" is less formal and not commonly used in professional contexts.
See if you can phrase that in the form of a sentence.
He was multilingual, a speaker and writer of several languages.
"Guest speaker" is a noun phrase, consisting of an adjective (guest) and a noun (speaker); it is not a compound preposition.
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Two teachers with Master's Degrees.
The phrase "to my liking" means that something is pleasing or satisfactory to the speaker's personal taste or preference. It indicates that the speaker finds the thing in question enjoyable or agreeable according to their individual standards.
It is a phrase said out of anger. It can be used as an alternate to "**** off". This phrase does not mean the speaker actually wants you to give him oral sex. On the other hand, the speaker could be suggesting you to literally give him oral sex. Knowing the difference is the way it is said.
Both phrases, "introduction to the guest speaker" and "introduction of the guest speaker," can be correct depending on the context. "Introduction to the guest speaker" implies an overview or preface about who the speaker is, while "introduction of the guest speaker" refers to the act of presenting the speaker to the audience. Choose the phrase that best fits the situation you are describing.
Containing, expressing, or using exclamation; as, an exclamatory phrase or speaker.
D: long-range goals