Participants engaged in a complex visual search task not only failed to see a woman entering the scene , but also failed to hear her scratching her fingernails down a chalkboard .
The year 2012 will see more commercial aircraft deliveries hitting the market and financiers may be scratching their heads to work out how the funding requirements will be met .
It 's like an itch we can 't resist scratching , even though scratching invariably makes it worse .
就像一处我们不得不挠的搔痒,即使挠它会使它更痒也还是要挠。
It looks as fragile as glass , but this stuff can endure any amount of scratching and kicking , and is pliant enough for most sitters .
它看起来宛如玻璃般易碎,但是实际上这种材料能耐受任何程度的刮擦和撞击,而且能承受大部分人的体重。
This dog is always scratching .
这只狗总是在搔痒。
She 's tormented by their scratching at night .
她晚上被它们的抓挠声折磨得要命。
Sometimes itching can occur inexplicably , without any apparent physical symptoms , and a patient 's unchecked scratching can lead to excessive skin damage or worse .