我们全家和所有的亲戚都来参加祖父的八十岁寿宴.All our family came to our grandfather's eightieth birthday party.他虽有八十岁了, 但仍然充满了活力.Although he is eighty, he is still very much alive.他祖父现在一定快八十岁了.His grandfather must now be getting on for e...
电机出故障了.There is something wrong with the motor.转盘由一根传动带与电机相连。The turning disc is connected by a drive belt to an electric motor.离心机不通过调速箱直接与电机驱动装置相连.Centrifugal machines are connected to the motor drive directly instead ...