The colours are magnificent, but the question of exactly why some trees turn yellow or orange, and others red or purple, is something which has long puzzled scientists.
这些颜色很瑰丽，但究竟为什么有些树会变成黄色或橙色，而有些树会变成红色或紫色，这个问题一直困扰着科学家。
With winter coming, leaves of trees turn yellow and begin to fall.
随着冬天的到来，树叶变黄，开始飘落。
The maple trees turn brilliant red in autumn, adding another dimension to the colors in the harvest season.
枫叶在秋天变成了鲜红的颜色，为丰收的季节增添了另一抹色彩。
Maple trees turn red in autumn.
枫叶在秋天变红了。
It is in spring. The trees turn.
春天天气暖和。树变绿。
In spring, the trees turn green.
春天，树变绿了。
树木在春天变绿。
Trees turn green when spring comes.
春天来临，树叶转绿。
Trees turn green when spring comes.
当春天到来的时候，树叶绿了。
Maple trees turn crimson in autumn.
枫叶在秋天变成深红色。
In autumn leaves of trees turn red.
树叶在秋天变红。
The trees turn green when spring comes.
当春天来临的时候树木开始变绿了。
Spring coming on, the trees turn green.
春天来了，树都变绿了。
树变成绿色。
With spring coming on, trees turn green.
春天到了，树变绿了。
It's warm in spring. The trees turn green.
春天很温暖，树都变绿了。
Trees turn green and flowers start to blossom.
树木变绿了，鲜花开始绽放。
Trees turn green and flowers start to blossom..
树变绿了，鲜花也开始绽放。
The trees turn green, and the flowers come out.
树变绿了，花儿开了。
Trees turn green and flowers start to blossom...
树变绿了，鲜花也开始绽放。
With spring coming, grasses and trees turn green.
随着春天的到来，草和树都披上了绿装。
The trees turn green and the flowers start to grow.
树开始变绿了，花儿开始生长。
The leaves of the trees turn green when spring comes.
当春天来临时，树叶就变绿了。
The trees turn green and the flowers start to come out.
树变绿了，花儿开始生长，一切开始生长。
The trees turn green and all the flowers are coming ont.
很多树木变成了绿色，花朵含苞待放。
In the autumn, the leaves on the trees turn yellow and red.
在秋季，树上的叶子变黄，变红了。
In the autumn, the leaves on the trees turn yellow and red.
在秋天，树上的叶子变黄，变红了。
In the autumn, the leaves on the trees turn yellow and red.
在秋天，树上的叶子变黄，变红了。
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