Gas dilates the balloon.气体使汽球膨胀.Exercise dilates blood vessels on the surface of the brain.运动会使大脑表层的血管扩张。The pupil of the eye dilates and contracts in response to light.作为对光线作出的反应,眼睛的瞳孔会放大或缩小....
The accident has echoes of past disasters.那起事故仿佛是过去灾难的重现。The sound echoes back from the walls.这声音从墙壁发出回声.I could hear the echoes in this temple.我在这座庙里能听到回声....