rú tóng liǎng dī shuǐ

be like two drops of water

The Chinese phrase '如同两滴水' is used to describe two people or things that are very similar or identical in appearance or characteristics. It highlights the notion of likeness, often used when comparing siblings, friends, or similar objects. The phrase conveys the idea that, like two drops of water, the differences between the two are minimal or non-existent.