牢固的成语怎么说英语

"牢固" (láogù) is a Chinese adjective that means "firm" or "strong." Here are a few possible translations of this word into English:
Firm: This adjective describes something that is solid, stable, and not easily moved or damaged. It can be used to describe objects, structures, or ideas. For example: "The bridge is built on firm foundations, so it should be able to withstand strong winds and earthquakes."
Strong: This adjective describes something that is physically powerful or able to withstand a lot of force or pressure. It can be used to describe people, animals, materials, or natural phenomena. For example: "The door is made of strong steel, so it's very difficult to break down."
Solid: This adjective describes something that is substantial, well-made, or reliable. It can be used to describe objects, structures, or foundations. For example: "The foundation of the building is very solid, so it should last for many years."
So, if you wanted to describe something as "牢固" in English, you could use one of these adjectives to convey the sense of strength or stability.