From the Middle East the Chinese acquired a blue pigment—a purified form of cobalt oxide 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。
When Tess had accomplished this feat she found herself to be standing on a carpeted level, which stretched to the east and west as far as the eye could reach.
苔丝作完比较,就已经走到了山谷中绿草如茵的平地上,这块平地从东到西伸展开来,远得眼睛看不见边。
The immediate cause of the problems is the behaviour of the jet stream, a band of high-level wind that travels east around the world and influences much of the weather below it.
引起这些问题的直接原因是急流[注1]的运动方式 ----在高空、绕地球向东流动并能给下面的天气造成很大影响的一股风。
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