例句與造句

1. Neutrinos are extremely abundant, so if they have even a little mass they could help explain the so-called missing mass problem, which is that scientists have found far less mass than the universe appears to contain.
2. The 2006 observation of a pair of colliding galaxy clusters known as the " Bullet Cluster ", poses a significant challenge for all theories proposing a modified gravity solution to the missing mass problem, including MOND . Astronomers measured the distribution of stellar and gas mass in the clusters using visible and X-ray light, respectively, and in addition mapped the inferred dark matter density using gravitational lensing.
3. It's difficult to find missing mass problem in a sentence. 用missing mass problem造句挺難的