Calcene
胶质碳酸钙, 白艳华(补强剂)
🗣️ 情景例句
Yor're quite right.
您说得对。
I eat dinner at about 7 o'clock.
我在大约7点钟吃晚饭。
it must be known to any kind of radio astronomer in the universe.
这个频率是宇宙中任何射电天文学家都应该熟悉的。