今日挑戰句子
影片不是英文？
每日口說挑戰【科學知識】你知道為什麼秋天葉子會變色嗎? Why Do Autumn Leaves Change Color? (Why Do Autumn Leaves Change Color? - Instant Egghead #51)
主持人 : Kristi Yang
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熱愛慢跑、瑜伽、吉他， 更喜歡在中文和英文之間找到平衡點。
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史帕德11 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.
unickname11 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 11 年前
so tiring today but it's great
Hubert Lin11 年前
Keep the mouth opening.....
wonderjuly11 年前
practice :)
Hupson669711 年前
practice
JRC11 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.
PSR11 年前
王立婷11 年前
為什麼這裡的leaf用單數不用複數leaves呢~~?
starine073011 年前