Pentafluoride
五氟化物
🗣️ 情景例句
Hi. This is Robbie Stewart.
你好。我是Robbie Stewart。
There is no sense in criticizing him.
批评他也没有用。
it has to develop (partly by means of touch) the ability to judge roughly three-dimensonal distances.
儿童必须发展（部分通过触觉）粗略判断三维空间距离的能力。