一叶知秋，一雨知寒。

一叶知秋，汉语成语，意思是从一片树叶的凋落，知道秋天的到来。比喻通过个别的细微的迹象，可以看到整个形势的发展趋向与结果。出自 《淮南子·说山训》。“叶”指的是梧桐落叶。

“一叶知秋”用英语怎么说呢？

• One falling leaf is indicative of the coming of autumn
• The falling of one leaf heralds [indicates] the autumn
• The fall of one leaf is enough to tell of autumn&39;s arrival
• You may know by a handful the whole sack.

leaf是名词，意思是：树叶，复数是leaves

leave是动词，意思是：离开，第三人称单数是leaves

You may know by a handful the whole sack.

由一斑可知全貌，一叶知秋

The proverb means that we can judge a person’s character on very small evidence. For example, a generous action suggests a kindly nature, and a callous remark a hard, unfeeling heart.

这句谚语的意思是我们可以根据很小的证据来判断一个人的性格。例如，慷慨的行为意味着善良的本性，而无情的话意味着冷酷无情的心。

Why Plant Leaves Turn Yellow？

为什么植物的叶子会变黄?

1.Poor drainage or improper watering

排水不良或浇水不当

2.Root damage or compacted roots

根系损伤或压实

3.Improper soil pH

土壤pH值不当

4.Lack of proper nutrients

缺乏适当营养

内容参考：

http://ythi.net/idioms-proverbs/english/you-may-know-by-a-handful-the-whole-sack/

http://www.pennington.com/all-products/fertilizer/resources/why-plant-leaves-turn-yellow-and-how-to-fix-them

情话一：

I like flowers in spring, trees in summer, dusk in autumn, snow in winter and you every day.

我喜欢春天的花，夏天的树，秋天的黄昏，冬天的雪以及每天的你。

情话二：

I can love you four days.

Spring, summer, autumn ,winter!

Oh no! Maybe three days.

Yesterday, today, and tomorrow!

How about two days?

Day and night!

One day is enough.

Everyday!

我可以有四天爱你。

春天，夏天，秋天，冬天

哦，不！也许只用三天。

昨天，今天，明天

要不两天吧。

白天与黑夜

其实一天也够。

每一天。

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