At low densities, the bacteria produced AHL, but none of the other three proteins. At higher densities, AHL began to accumulate within the cells, triggering a positive feedback loop that prompted the bacteria to produce more AHL and start making the other two proteins too. This made the bacteria glow, until enough of the "off switch" chemical accumulated to turn the system off. The result of this was bacteria that flickered, but each in its own rhythm.
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We would all eat until we were full enough, but there were always about half of the potatoes leftover.
我们会一直吃到吃饱为止,但土豆总是剩下一半左右。
The perchlorates in the mud then sucked moisture out of the air until there was enough water for them to dissolve (a process known as deliquescence).
泥中的高氯酸盐于是吸收空气中的湿气,直到有足够的水使其溶解(这个过程叫作“潮解”)。
More likely, they could just back away from Treasury bonds until the yields rise enough to compensate them for the higher risk of default.
可能性更大的是他们会因为担心而干脆卖掉美国公债,直到收益率升至足以抵偿更高的违约风险。
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