Schulzite
单硫锑铅矿
🗣️ 情景例句
Good. What do you think, Richard?
好。 你看呢 Richard？
Nice to see you, my old friend.
真高兴见到你，我的老朋友。
namely 6 million million miles.) Radio waves also travel at the speed of light,
即6万亿英里）。无线电波也是以光速传播的。