例句與造句

1. Because the threshold exposure levels for photic damage to the retina at each wavelength of the optical spectrum are well known , it is fairly simple to calculate the maximum permissible filter transmittance that will provide adequate retinal protection from sunlight
   由于每種波長(zhǎng)光線的極限值都已被測(cè)定,所以要計(jì)算出安全太陽(yáng)濾鏡最高允許透光率是很容易的
2. It's difficult to find threshold exposure in a sentence. 用threshold exposure造句挺難的