primary source material

基本解释

Source material: Primary source for all four librettos is Schott's 1899 vocal scores (republished in the United States by Schirmer in 1904).
資料來源：四個版本都來源於1899年Schott出版的歌譜（該歌譜1904年在美國由Schirmer再版）。
One material source of diamond is primary diamond mines and ancient placer in the ancient Yi River upstream in Shandong, the other is the primary diamond mine which may exist in this area.
金剛石的物質來源一是古沂河上遊山東的金剛石原生鑛和古砂鑛，二是本區的可能存在的金剛石原生鑛。
After the timeline was completed, the students were arranged in groups, and each group did a critical analysis of primary-source material, focusing on the efforts each side made to avoid the war.
經過時間完成了，學生們被安排在組，每組做了批判性分析的主要源材料，著眼於努力，每一方，以避免戰爭。

"We've always had the philosophy that we're the primary source for this material, " he says.
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