Blocknut
保险螺帽, 防松螺帽
🗣️ 情景例句
It's about my grandfather.
是关于我爷爷。
Do you have my pencil?
你拿了我的铅笔吗？
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我们所知道的现有恒星数目估计约有30亿×1000亿颗。