pre-main sequence star

例句：

1. 1. The discovery of this starhas sparked excitement among astronomers.
   这颗星的发现让天文学家们兴奋不已。
2. 2. This star is located inthe constellation of Orion,known for its brightest stars.
   这颗星位于猎户座，以其最亮的恒星而闻名。
3. 3. The star's positionand magnitude are crucial for understanding its evolution.
   这颗星的位置和亮度对于理解其演化至关重要。