at the sound of

• The horse took a fright at the sound of the explosion
  马听到爆炸声受了惊。
• The dog cocked its ears at the sound of footsteps
  狗听到脚步声竖起了耳朵。
• He jumped up at the sound of her light footsteps
  他听见她那轻盈的步履声便一跃而起。
• He was surprised at the sound of his own voice
  他为自己说话时的声音吃惊。
• The birds scattered at the sound of the gun
  鸟群一听到枪声就四处飞散了。
• George had turned at the sound of her arrival
  乔治听见她到来便转过身来。
• The animals took fright at the sound of the gun
  那些动物受到枪声的惊吓
• The horse took a fright at the sound of the explosion
  马听到爆炸声受了惊
• The birds scattered at the sound of the gun
  鸟一听到枪声就四处飞散了。
• She started at the sound of my voice
  她听到了我的声音，蓦地一惊。