What causes some trees to stay green all year round?

为什么某些树木一年四季都可以保持绿色呢？

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？

OK, so now we know what kind of tree stays green all the time, but why?

好的，现在我们知道什么样的树是长青的，但这是为什么呢？

He said he realized that green technology does not stay green once it is no longer being used.

他说，他意识到，一旦绿色技术不再被使用，它就不会一直保持绿色。

So the idea of something that stays green all year, so bringing that into your house, it means something.

所以，那是说全年保持绿色的东西，所以把它带到你家中，就是那个。

Jones and 12 farmers are working to build up soil carbon by cultivating grasses that stay green all year round.

Jones和12位农民正在一起通过培育全年常绿的草来增加土壤中的碳质。

So the idea of something that stays green all year, so bringing that into your house it, it means something.

它代表着四季常青，能够让你的房子充满活力，它是有寓意的。

These leaves stay green until the autumn days arrive.

这些叶子一直保持绿色，直到秋天到来。

Coniferous trees are trees that have needles instead of leaves, and they stay green year round.

针叶树是有针叶而不是叶子的树木，它们全年都保持绿色。

Solar panels and wind turbines outside the city and on top of buildings would also lessen emissions and help our utopian city stay green.

城市外和建筑物顶部的太阳能电池板和风力涡轮机也将减少排放并帮助我们的乌托邦城市保持绿色。

[Bella] My name is Bella. I live in Chicago. I'm seven years old. I want to know why leaves only change in fall and they stay green in the summer and spring.

我想知道为什么树叶只在秋天变色， 而在夏季和春季仍保持绿色。

Large trees nourish smaller shaded ones until they are tall enough to reach sunlight, and trees that stay green all year round share nutrients with trees that lose their leaves in winter-helping them through the season.

大树滋养着小树苗，直到它们长得足够高，能够接触到阳光为止。常绿的树木会与冬天落叶的树木分享营养，帮助它们度过寒冬。