Fluorbaryt
熒石
??? 情景例句
Yes, it is. Come up.
是的 是我。請上來
What time does the first train to Boston leave?
第一班去波士頓的列車什么時間開出呢？
it has to develop (partly by means of touch) the ability to judge roughly three-dimensonal distances.
兒童必須發展（部分通過觸覺）粗略判斷三維空間距離的能力。