understand by listening

I understand the explanation.

私は説明を理解します

I understand the explanation well.

私は説明をよく理解します

I understand the explanation well the first time.

私は説明を一度でよく理解します

I understand the difficult grammar explanation well the first time.

私は難しい文法の説明を一度でよく理解します

I understand the difficult grammar explanation well the first time during the lesson.

私は授業中に難しい文法の説明を一度でよく理解します