Deciduous means that the trees' leaves turn different colors and fall off each year.

落指树木会变成不同，且每年都会凋落。

In some tropical forests, the trees' leaves will fall off in the dry season just like deciduous forests.

一些热带森林中，树木旱季会像落林一样凋落。

Just like the leaves falling every autumn, the trunks themselves return to the soil to feed the next generation.

就像是每年秋天凋落，树干再回到土壤中继续养育下一代。

Dead leaves floated on the surface of the water.

【surface】凋落树漂浮水面。

They are formed in the preceding year, a little while before the leaves begin to fall; and as they form, they loosen the old leaves, and soon push them off.

它们前一年就已经形成，就是树凋落之前一小段时间形成；它们形成后就会松开老，然后将它们挤掉。