From the Middle East the Chinese acquired a blue pigment—a purified form of cobaltoxide unobtainable at that time in China—that contained only a low level of manganese.
中国人从中东获得了一种蓝色颜料，这是一种当时在中国很难得到的纯净的氧化钴，这种颜料只含有少量的锰。
2
Oxygen from the air took the place of the cobaltoxide.
空气中的氧气代替了钴氧化物。
3
One of the electrodes, the cathode, is made of lithium cobaltoxide;