Borides
硼化物陶瓷材料
🗣️ 情景例句
to ask Dad to sign as a guarantor.
请爸爸当担保人为我签字。
If you're not sure how to do is, ask me.
假如你拿不准怎样做，就来问我好了。
I doubted whether the story is true.
我怀疑那故事是不是真的。