Pericambium
周边形成层(指根的中心柱最外部细胞层)
🗣️ 情景例句
OK.
好。
Here's a prescription for a painkiller.
这是止痛的处方。
They are constantly after the turtles, who peacefully submit to all sorts of indignities.
它们经常追逐海龟，海龟则温顺地忍受着各种侮辱。