他用微型声波发射器开启了门。He activated the door with the miniature sonic transmitter.这个声音的声波如图B所示。The sound waves of the voice could be diagramed as in B.声波在真空里不能传播.Sound waves will not travel through a vacuum....
He may be able to nullify that disadvantage by offering a wider variety of produce.他也许能通过供应更为多样化的农产品来抵消那一劣势。This, of course, would nullify the effect of the move and merely accelerate inflation.这毫无疑问会使该举措完全失效，而仅仅只是加速通货膨胀...