sternellum

例句：

1. 1.The starry sky above us is a reminder of the vastness of the universe.
   我们头顶上的星空提醒我们宇宙的广阔。
2. 2.The astronomy department at our university has been studying sternellums for decades.
   我们大学天文学系研究星云已经几十年了。
3. 3. The sternellum in the constellation Orion is known for its brightest stars.
   猎户座中的星云以其最亮的星星而闻名。