双语例句原声例句权威例句
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Titanium is useful at low concentration only.
钛只在低浓度时起作用。
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In some cases, even a low concentration of green tea was effective.
在某些例子中，即便是低浓度的绿茶都有效果。
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It works at a very low concentration-10 parts per billion-so you can't smell the compound.
这种物质在极低浓度下(10ppb)就可以发挥作用，因此，你是闻不到这种物质的。
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They move from regions of high concentration to regions of low concentration by this natural flow down a concentration gradient.
从高浓度区域,向低浓度区域流动,顺浓度梯度流动
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