bi 253造句

例句与造句

1. BI 253 has been proposed as a runaway star because of its relatively isolated position outside the main star-forming areas of 30 Doradus.
2. When the classification of the earliest type O stars was refined in 2002, the complete lack of neutral helium or doubly ionised nitrogen lines in the spectrum led to BI 253 being placed in a new O2 V class.
3. It's difficult to find bi 253 in a sentence. 用bi 253造句挺难的