Celestobarite
锶重晶石
🗣️ 情景例句
It's tough getting an O.K. from the boss.
很难从老板那听到声“同意”。
It's such a nice change.
真实令人高兴的转变。
We enjoy reading about them, especially when we find that, like the praying mantis, they lead perfectly horrible lives.
我们喜欢看有关昆虫的书，尤其是当我们了解螳螂等过着一种令人生畏的生活时，就更加爱读有关昆虫的书了。