美国牛奶中发现低量放射物。

Low Levels of Radiation Found in American milk.

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低量滴灌或微灌是节水技术，已在其近数年。

Low volume drip or micro irrigation is a water-saving technology that has come into its own in recent years.

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专家说三聚氰胺可以通过象塑料餐具这样的物品以低量渗透进食物。

Experts say melamine sometimes accidentally leaches into the food supply in low levels, from things like plastic dinnerware.

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The z effective is lower, so we have to put less energy in to get an ion out.

它的有效核电量更低，所以我们只需要更少的能量就能打出一个离子。

麻省理工公开课 - 化学原理课程节选

So, for example, we have this average level, and then it can go high where we have the peak, or it can go very low. We can also discuss sound waves, so again it's just the periodic variation of some property -- in this case we're talking about density, so we have high density areas and low density areas.

例如这是平均位置，在峰的位置水位高，在谷水位低，我们也可以,讨论声波它也是某种,量的周期变化，在这里我们,讨论的是密度,我们有高密度区和低密度区。

麻省理工公开课 - 化学原理课程节选