树叶在秋天改变颜色。
在秋天，很多叶子都从树上飘落。
叶子在秋天落下，但在春天生长。
人们相信，如果龙进入他们的房子，他们会有一年的好运气，在秋天有一个好收成。
People believed that if the dragon went into their houses, they could have good luck all year round and have a good harvest in autumn.
这个节日在秋天的黄金时期到来。
在秋天，总会有摘水果的活动。
在秋天，树叶变了颜色，从树上掉下来。
During autumn, the leaves change color and fall down from the trees.
我们在秋天比赛三次。
在秋天，伐木工人照例来砍伐一些最大的树。
In autumn the wood-cutters always came and felled some of the largest trees.
枫叶在秋天变红了。
叶子在秋天都掉了。
枫叶在秋天变红。
在秋天树叶落了。
18世纪，人们在秋天放飞风筝，对丰收表示感谢。
In the 1700s, kites were flown in autumn to give thanks for a good harvest.
有没有其他方法来防止这些树在秋天过度暴露在阳光下？
Do these trees have other means at their disposal to prevent overexposure to light in autumn?
如果你春天种下西瓜的种子，那你在秋天就能吃上新鲜的西瓜了。
If you plant watermelon seeds in the spring, you will be eating fresh watermelon in the fall.
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。
The maple trees turn brilliant red in autumn, adding another dimension to the colors in the harvest season.
这听起来很矛盾，因为这一假设背后的理念是，树叶在秋天产生的红色素是用于保护叶绿素这种吸收光的化学物质，以免它吸收过多的光。
It sounds paradoxical, because the idea behind this hypothesis is that the red pigment is made in autumn leaves to protect chlorophyll, the light-absorbing chemical, from too much light.
在秋天，很多树叶变黄并从树上落下。
In autumn, quite a few leaves turn yellow and fall off the trees.
有一半水果作物在秋天突如其来的严寒中冻死了。
在秋天，青蛙取笑松鼠的勤劳。
这就是生日在秋天的麻烦。
在秋天花草都枯萎了。
树叶在秋天变黄。
那个小男孩问他的父母为什么树在秋天掉叶子。
That little boy asked his parents why the leaves fall from the trees in autumn.
枫叶在秋天变红了。
在秋天有一些特定的节日，都是有关自然的主题。
And on specific holidays that deal with the themes of nature in the fall.
我喜欢在秋天的山野游玩，因为那里的树叶会变成鲜艳的颜色。
In fall, I like to visit the mountains because the foliage there changes into such vivid colors.
我喜欢在秋天的山野游玩，因为那里的树叶会变成鲜艳的颜色。
In fall, I like to visit the mountains because the foliage there changes into such vivid colors.
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