Pentafluoride
五氟化物
🗣️ 情景例句
Dad was a busy doctor,
爸爸是个很忙的医生，
He that lives well is learned enough.
生活好者，博学多才。
at eighty can knock us out, and into our grave.
能到了80岁可能会使我们一蹶不振而进入坟墓。