它们不仅仅是简简单单的蛇，它们还能“飞”——将它们自己从栖木上甩出来，撑平自己的身体，滑翔于树与树之间、树与地之间。

Not only are they snakes, but they can "fly" -- flinging themselves off their perches, flattening their bodies, and gliding from tree to tree or to the ground.

youdao

但是，这的确说明对于居于树上、即使是那些根本不能飞的树栖生物来说，羽毛可能真的有助于它们的生活。

But it does suggest feathers may have helped promote life in the trees, even for creatures that could not actually fly.

youdao

一起飞，这些树蛇就可以看到滑行路径两旁的树，一些就转变方向朝树木飞去。

Once airborne, and thus able to observe trees to the side of their glide-paths, some of the snakes turned towards them.

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