duplicate bands

• 两条(指色谱点样法)

duplicate bands的用法和样例：

例句

1. Any of various coniferous evergreen trees of the genus Tsuga of North America and eastern Asia,having small cones and short,flat leaves with two white bands underneath.
   铁杉属树木北美及东亚铁杉属中松柏科常青树的一种，有小的孢子叶球及短而平的叶子，叶下有两条白色的条纹。