Some always stay green and never drop their leaves, but why?

有些树木是长青的，从不掉叶子，但这是为什么呢？

" They change all of a sudden, or they drop leaves early, " Sundberg said.

" 它们突然变了，很早就落叶了。"

Evergreen trees on the other hand, don't need to drop their leaves as it gets colder, drier, and darker.

另一方面，常青树不需要随着天气变冷、变干、变暗而落叶。

Cow drops, leave it in the sun...

如果牛白天死了。

The maples and birches turned bright colors and the wind shook them and they dropped their leaves one by one to the ground.

枫树和桦树们变得分外鲜艳，在秋风的吹动下，它们的红叶子一片，一片地落到了地上。

The land dries up and wastes away, Lebanon is ashamed and withers; Sharon is like the Arabah, and Bashan and Carmel drop their leaves.

地上悲哀衰残，黎巴嫩羞愧枯干，沙仑像旷野，巴珊和迦密的树林凋残。

The other basic type of tree is called an evergreen which are any trees you see that keep their leaves or needles year-round, but that doesn't mean they never drop their leaves.

另一种类型的树木被称为常青树，也就是你看到的一年四季都有叶子或针叶的树木，但这并不意味着它们从不掉叶子。

Instead of shedding as it gets colder, evergreens just drop a few leaves here or there all year while new ones grow in, kind of like how our hair grows on our heads.

常青树不是随着天气变冷而落叶，而是全年都会掉叶子，同时也会由新的叶子长出来，有点像我们头顶的头发的生长掉落过程。