许多国家在一项叫做“大规模药物配给（MDA）”的战略中运用伊维菌素，该战略意味着在感染疾病的地区针对全部人口每年给药一两次。

Many countries use ivermectin in a strategy called mass drug administration (MDA), which means that the entire population in an affected area is given the drug once or twice a year.

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从每条路径的折射率——再运用一些适当的计算处理能力——就可以组成一个三维图像。

From the refractive index of each path it is possible-with the application of some suitably crunchy computing power-to produce a three-dimensional image.

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我们主要还是关注，参数方程的运用，主要是一维的，比如直线、曲线等。

So, we have mostly focused on the use of parametric equations just for one dimensional objects, lines, and curves.

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