The medial pterygoid muscle is one of the important muscles for moving the jaw.

He was my student, but now he has become so proficient that it can be said 'the student has surpassed his teacher.'

He always buys cheap things, so in the end, it becomes 'penny wise and pound foolish'.

Acidic oxides react with water to produce acids.

Aluminum is an amphoteric oxide, it reacts with both acids and bases.

Peroxides play an important role in chemical reactions.

I will participate in an obstacle race this weekend.

In this situation, the proverb 'it is best to submit to circumstances' applies.

Since he started his new job, he's been lively as if he were a fish back in water.

He absorbs new information like a sponge soaking up water.