例句與造句

1. Taking the famous m87 elliptical galaxy as example , the dark matter in its core runs up to 2 . 4 billion solar masses
   其中最著名的m87橢圓星系，其核心的黑暗質(zhì)量竟達(dá)24億太陽(yáng)質(zhì)量！
2. It's difficult to find core run in a sentence. 用core run造句挺難的