... theory of excitation 兴奋说 theory of germinal continuity 种质说 theory of natural selection 天演论 ...
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哈德利说，沙特阿拉伯官员认为，石油价格的上涨更多地是由于人们对全球市场走向不确定，以及缺少提炼最容易获得的那种质量的石油的能力。
Hadley says Saudi officials argue that higher prices are driven more by uncertainty in the global market and the lack of refining capacity for the quality of oil most readily available.
也就是说，LED本身现在正在改进照明质量，而且这种质量是我们需要的。
That said, the LEDs themselves are now producing the light quantities and qualities we need, and the costs are improving.
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