Bortam
[冶]硅硼钛铝锰合金
🗣️ 情景例句
I'm on the top floor.
我在顶层。
Christmas comes but once a year.
佳节良辰，机会难得。
There, a child grows up under the ever-present attention of his parents;
荒凉地区的孩子无时无刻不在父母关怀下成长。