No chemical flavoring is used in this ramen at all.

His long talk is just like 'a hundred days of sermonizing without a fart.'

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.

Basic oxides react with acids to produce salt and water.

This area is affected by radioactive fallout from past nuclear tests.