Meat is, at best, a secondary source of essential elements.

肉类充其量不过是身体基本要素的次要来源。

Then, the design and manufacture of a set of secondary source are finished.

引入次级声场的理论推导并完成了引入次级声场装置的设计、制造。

It defines templates for the elements in the main source and the secondary sources.

它定义了用于主源文档和辅助源文档中各元素的模板。

The granites not only caused the remobilization of gold but also serve as the secondary source bed.

花岗岩不仅使金活化转移，而且也是第二矿源层。

Don't rely exclusively on a single secondary source for information or opinion in a research paper.

在一篇研究论文中，不要在信息或观点上排他性地依赖单独一处二手资料。