Chlorophyll breaks down and is replenished all summer long. As daylight hours shorten, however, veins that bring water and nutrients to the leaf gradually close off.
How I wish I could be as awesome as the hostess here!!!! And also I've gained much useful information from these videos.
Chlorophyll breaks down and is replenished all summer long. As daylight hours shorten, however, veins that bring water and nutrients to the leaf gradually close off.
0:00
unickname10 年前
1. ...which I will explain in a minute. 待會我就會解釋這個部分。2. Now that you know the science behind colorful autumn leaves, let's identify some of them.既然你已經知道秋天葉子變色背後的原理，讓我們來看看一些例子吧！
0:00
Ian Greig 10 年前
so tiring today but it's great
0:00
Hubert Lin10 年前
Keep the mouth opening.....
0:00
wonderjuly10 年前
practice :)
0:00
Hupson669710 年前
practice
0:00
JRC10 年前
Chlorophyll breaks down and is replenished all summer long. As daylight hours shorten, however, veins that bring water and nutrients to the leaf gradually close off.
史帕德10 年前
How I wish I could be as awesome as the hostess here!!!! And also I've gained much useful information from these videos.
Chlorophyll breaks down and is replenished all summer long. As daylight hours shorten, however, veins that bring water and nutrients to the leaf gradually close off.
unickname10 年前
1. ...which I will explain in a minute. 待會我就會解釋這個部分。2. Now that you know the science behind colorful autumn leaves, let's identify some of them.既然你已經知道秋天葉子變色背後的原理，讓我們來看看一些例子吧！
Ian Greig 10 年前
so tiring today but it's great
Hubert Lin10 年前
Keep the mouth opening.....
wonderjuly10 年前
practice :)
Hupson669710 年前
practice
JRC10 年前
Chlorophyll breaks down and is replenished all summer long. As daylight hours shorten, however, veins that bring water and nutrients to the leaf gradually close off.
PSR10 年前
王立婷10 年前
為什麼這裡的leaf用單數不用複數leaves呢~~?
starine073010 年前