A mineral concretion , usually of calcium carbonate , occurring in the epidermal cells of certain plants , such as figs .
钟乳体一种矿石凝结物，通常为碳酸钙，在某些植物的表皮细胞中产生，如无花果。
In this course , the teacher should act leading part combined with some concretion teaching plan , this paper tries to approach the teaching method of junior high school chemistry teaching .
本文结合一些具体教案，试图探讨初中化学教学中与此相适应的一些教学方法。
It is not only the right affirmed , ensured , and restricted by law and statutes , the inherent right by nation itself , but also the concretion of the system of regional national autonomy from constitution and law .
