technetium star造句

例句与造句

1. Technetium stars belong to the classes variable stars of the long period variable types.
2. Stars with strong Tc lines are sometimes referred to as Technetium stars, and they can be of class M, S, C, or the intermediate MS and SC.
3. It's difficult to find technetium star in a sentence. 用technetium star造句挺难的