例句與造句

1. You may well ask how that is possible . tourmalines are mixed crystals of aluminium boron silicate with a complex and changing composition . it s a rather complex mineral group
   是極為復(fù)雜的硼鋁硅酸鹽，其中可含一種或數(shù)種以下成分：鎂鈉鋰鐵鉀或其他金屬。
2. It's difficult to find complex mineral in a sentence. 用complex mineral造句挺難的