stray birds of summer come to my window to sing and fly away.

and yellow leaves of autumn, which have no songs, flutter and fall

there with a sign.

译文：

夏天的飞鸟，飞到我的窗前唱歌，又飞去了。

秋天的黄叶，它们没有什么可唱，只叹息一声，飞落在那里。

Have you ever watched a snail move?

A snail leaves behind a slivery trail as it moves.

The slivery trail is slime.

The slime helps the snail slide along.

译文:

你观察过蜗牛爬行吗？

蜗牛爬行时，会留下一条银白色的痕迹。

这条银白色的痕迹是黏液。

黏液有助于蜗牛滑行。