Second, scientists who have observed, Hans find that single lines are perfectly capable of getting enough food alone.

其次，科学家发现，汉斯发现单系完全有能力单独获得足够食物。

In 1986, Yuan brought up the hybrid rice breeding strategy from the three-line hybrid rice strain to a two-line, and later on to a one-line variety.

1986年， 袁提出杂交水稻育种策略， 从三系杂交水稻品系到两系，再到单系品种。

And that path is represented by a single branch coming off of the tree, meaning that bryophytes are monophyletic — they share a single common ancestor and are all more closely related to each other than to any other plant group.

这条路径由一棵树上一个表示，这意味着苔藓植物是单系——它有一个共同祖先，彼此之间关系比与任何其他植物群体关系都要密切。