Hexahydrite
六水泻盐
🗣️ 情景例句
This is he speaking.
我就是。
Excuse me for that.
对不起我为那件事。
the necessary method of study is to group the relevant material and to take note of all possible variant forms and conditions.
应采取的研究方法是，把有关各方面的材料汇集起来，同时注意任何可能出现的异常情况和条件。