例句與造句

1. If you have knowledge in simple image processing , you may reduce the noise further by taking many exposure on the same object , and stack them together in computer . after gaining some experience , you many want to take close - up photos of clusters and nebula . since the magnifying and light collecting power of the camera lens is not enough , you have to connect the camera to a telescope
   在1868年，法國天文學(xué)家pierre janssen發(fā)現(xiàn)了在太陽的光譜中，有一條奇怪的光譜線，起初科學(xué)家以為這是一種地球上并不存在的物質(zhì)所造成的，所以把這種新物質(zhì)命名為氦英文為helium ，這個(gè)字來自希臘語的helio ，意思即為太陽。
2. It's difficult to find pierre janssen in a sentence. 用pierre janssen造句挺難的