例句與造句

1. Though some ideas of quark stars were proposed as early as in 1969 , no great progress had been made until the 1980s
   雖然天文學(xué)家早在1969年便提出奇異星的概念，但直至80年代，這個理論才有更進一步的發(fā)展。
2. Such sources are believed to be either quark stars or neutron stars , and a subclass of these are already observed by conventional means as pulsars or x - ray emitting celestial objects
   一般認為這些信號源就是夸克星或中子星，其中一些已經(jīng)通過傳統(tǒng)的方法觀測到，稱為脈沖星。
3. Gravitational waves are ripples in the fabric of space and time produced by events in our galaxy and throughout universe , such as black hole collisions , shockwaves from the cores of exploding supernovas , and rotating pulsars , neutron stars , and quark stars
   引力波是時空結(jié)構(gòu)的波動，由我們銀河系乃至整個宇宙中發(fā)生的事件，比如黑洞碰撞、超新星爆發(fā)時核心產(chǎn)生的激波以及旋轉(zhuǎn)的脈沖星、中子星和夸克星所產(chǎn)生。
4. It's difficult to find quark star in a sentence. 用quark star造句挺難的