原条（primitive streak）是发育生物学的概念，最先在鸟类胚胎发育中发现，从后端缘区向前伸展的条带，是由上胚层细胞向囊胚腔下陷造成的，功能上相当于两栖类的胚孔
n. bole
misc. primitive streak ; whole trunk
本文论述了原条量材设计原则及原木验收管理办法。
In this paper, the authors expound the principles of tree-length measuring design and management methods of logs checked and accepted.
用缆索起重机测量了红松、云杉、冷杉、椴木、杨木、桦木、栬木和榆木等树种原条的重心位置。
The article measures the gravity center locations of tree stems with cable crane, the species of tree stems including korean pine, drangon spruce, fa-ber fir, linden, poplar, birch, elm, etc.
第二岛链自小笠原群岛算起，沿马里亚纳群岛和关岛一路延伸到帕劳群岛，在日本和菲律宾以东构成一条南北走向的岛链。
The second chain of islands runs from the Bonins along the Marianas, Guam and Palau, forming a north-south line east of Japan and the Philippines.
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