melt into
phrasal verbmelt into something
to gradually become part of something and therefore become difficult to see 逐渐融入；渐渐与某物成为一体 Once the introductions had been made, she melted into the background. 一旦介绍完毕，她就融入了背景。 Before the boy's incredulous gaze the figure melted into thin air. 在男孩怀疑的目光下，那个身影消失在空气中。