"An elephant never forgets."
It's a saying you'll hear in some English-speaking countries.
But unlike most cute sayings俏皮話, this one is literally true一點都不誇張（exactly 100% true）.
The impressive memory of an elephant is an important sign of its intelligence.
Elephants can recognize every member of their herd by sight or smell.
This helps them while they're traveling in groups集體遷徙.
They also remember where dangerous situations occurred long after their first visit.
When elephants cross paths with enemies from the past, they can alert others in their herd about trouble nearby.
While （=when）memory helps elephants with survival, it also helps them form friendships建立友誼.
There is a story about two circus elephants who happily played with each other when they met again after 23 years apart.
Elephants can also recognize the humans they've bonded with.
At an animal rescue park in Africa, elephants treat the human keepers like part of the herd.
One elephant proudly took her new-born baby to the keepers who raised her long ago.
She let them take it for walks.
These stories show that an elephant's memory helps it relate to animals the way humans do.
herd [hɝd]
a large group of animal
詞性: n. 獸群v. 看守；放牧
例句:
We saw a herd of cattle on the farm yesterday.
昨天我們在農場見到了一群牛。
Dogs are often trained to herd sheep.
狗常被訓練來牧羊
circus
（n.）馬戲團
例句:
The children had a great time when the circus came to town.
馬戲團進城來時，小孩子最高興了。
字小補帖:僅供參考
literally（adv.）確實地;不誇張地
herd（n.）畜群;牧群
alert（v.）使警覺;向⋯發出警報
bond（v.）建立感情;建立友誼
bond with sb 與⋯建立感情
rescue（n.）救援;營救
cross sb.'s path
（ph.）與某人相遇（通常指不期而遇）
釋義
ph.片語
1.與某人相遇（通常指不期而遇）
I hope I never cross her path again. 但願我永遠不再遇見她。
We crossed her path at the station yesterday. 我們昨天在車站偶然碰到她
The Elephant's Memory: A Key to Survival and Making Friends
Elephants' personalities share similarities with our own.
They not only remember facts, but they develop feelings and emotions over long periods of time.
Unfortunately, this quality also makes it possible for elephants to experience post-traumatic stress disorder創傷後壓力症候群, also called PTSD.
Humans develop PTSD when we experience violence or a near loss of life.
Waking up in a burning house or surviving a plane crash, for instance, can create "emotional memories."
They can change our personalities for years or even a lifetime.
This happens to elephants when they lose their parents to hunting.
Often these animals are shot and killed in front of their children's eyes.
Another source of PTSD is when their forest habitats are cut down to make room for more people.
Traumatized elephants become violent and friendless, and will often kill herds of other animals for no reason.
This is why it's necessary to protect elephants and their habitats.
Hundreds of these beautiful creatures are hunted each day for their valuable ivory tusks.
The world might not have any elephants left by 2050.
More needs to be done to protect these sensitive animals.
ivory（n.）象牙adj. 象牙色；象牙做的
例:
In Asia, many elephants have been killed only because people like things made of ivory.
在亞洲，人們獵殺大象只是因為他們喜歡象牙製品。
In many countries around the world, you are not allowed to sell ivory products.
在世界許多國家內，象牙製品是禁止販售的
tusk（n.）（象、野豬等的）長牙，獠牙；尖形物；尖頭
clown（s）小丑
字彙小補帖
post-traumatic（adj.）創傷後的
habitat（n.）(動植物的)生長地、棲息地
traumatized（adj.）精神受到創傷的
tusk（n.）(大象、海象等動物的)長牙
