The chairs were equal distance away from the board and each of them would have a piece of chalk.
两人都坐在离黑板同样距离的椅子上。
2
To manipulate the display, users pick up a piece of wireless electronic "chalk" that can work either in contact with the surface or from a distance.
为了管理显示，用户选择一片能够在接触表面或者隔一段距离使用的无线电子“粉笔”。
3
From a distance, these building blocks look very similar, so every piece of DNA you look at has the same overall shape—the famous Watson-Crick Double Helix.
从远处看，这些基本成分看上去极为相似，因此 DNA 的每一部分的基本形状都是相同的 — 著名的沃森克里克双螺旋结构。