This is the 18035th most frequent Korean word.
수소를
"수소를" means "hydrogen" (as an object in a sentence).
The word '수소를' in this sentence is used as the object of the sentence, indicating that the presentation is about hydrogen.
수소를 주제로 한 발표를 준비했습니다.
I prepared a presentation themed around hydrogen.
Here, '수소를' is the object of the verb '고려하고 있습니다', stating that the action of considering is being performed on hydrogen.
우리는 수소를 미래의 에너지로 고려하고 있습니다.
We are considering hydrogen as a future energy source.
In this case, '수소를' is part of the phrase '수소를 포함한', describing the inclusion of hydrogen in compounds.