On the tip of a tree which had lost all its other leaves, two still remained hanging from one twig: Ole and Trufa.

在一棵其它叶子都掉光的树顶上，还有两片挂在一根细枝上：奥立和特鲁法。

One reason is straightforward: on many trees, the leaves that are the reddest are those on the side of the tree which gets most sun.

有个原因很简单：在许多树上，最红的叶子是那些在树的一侧得到最多阳光的叶子。

Summer leaves are green because they are full of chlorophyll, the molecule that captures sunlight converts that energy into new building materials for the tree.

夏天的树叶是绿色的，因为它们富含叶绿素，这种捕捉阳光的分子可以将这些能量转化为新的树木生长材料。