Potentially "high-yielding" clones are likely to be the material which first come to hand.
有“高产”可能的无性系大概首先是随手可得的材料。
I can obtain first-hand foreign scientific and technological material.
我能够获取第一手的国外科研材料。
The Analects of Confucius. of Confucius is the first-hand material to explore the tie between Confucius and Zhouyi.
《论语》是考证孔子与《周易》关系的第一手材料。
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