但和其他慈善机构一样，这些数字掩盖了实情。But as with other charitable bodies, these figures mask the true picture.它们看上去有益健康，实则掩盖了其为精加工食品这一事实。Their healthy image disguises the fact that they are highly processed foods.这个被用来掩盖他们思想的混乱和不准确。This...
A vibrating membrane in the ear helps to convey sounds to the brain.耳膜的振动帮助声音传送到大脑.In wind instruments the sound is produced by a vibrating air column.管乐器的声音是由振动的气柱产生的.Stationary waves are also produced in vibrating colu...