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

指的子会变成不同的颜色，并且每年都会凋。

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

一些热带森林，的子旱季会林一样凋。

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

就是每年秋天凋的子，干再回到土壤继续养育下一代。

Dead leaves floated on the surface of the water.

【surface】凋的漂浮水面。

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，就是凋之前的一小段时间形成；它们形成后就会松开老子，然后将它们挤掉。