Kurskite
氟钠磷灰石
🗣️ 情景例句
Hi, this is Mike Johnson.
嗨， 我是Mike Johnson。
Step by step the ladder is ascended.
登梯需要逐级登。
since ground stations and satellites cannot see everywhere.
因为地面工作站和卫星不可能看到地球上的每一个地方。