Russellite
n. [礦]鎢鉍礦
??? 情景例句
A man can develop his mind by reading.
讀書增進(jìn)個人的智慧。
Come what may, heaven won't fall.
船到橋頭自會直。
It is fairly clear that sleeping period must have some function,
很清楚，睡眠必然具有某種作用。