Lignitic
a. 褐煤的, 含褐煤的
🗣️ 情景例句
That's a great idea.
真是个好主意。
I've heard so much about you.
久仰大名。
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。