Liquefaction happens when soil experiences  an applied stress, like an earthquake, that causes it to behave like a liquid, and it  mostly happens in cohesionless soils - those where the grains don't stick together, such as sand.

当土壤受到外加应力（例如地震）时， 液化就会发生，导致其表现得像液体一样，并且它主要发生在无粘性土壤中 - 颗粒不粘在一起的土壤，例如沙子。