Jackie, 14, said the nicest thing a friend did for her was to tell her mom a secret Jackie had told to her friend - that she was extremely depressed.

14岁的杰克说她的一个朋友为她做的最好的事情就是把她告诉朋友的自己很低落的这个秘密告诉了杰克的母亲。

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These functions are helpful for simulations (so you can re-run the simulation), but they are extremely dangerous if you're using them to create secret keys for security.

虽然这些函数对于模拟程序来说是有帮助的（因此您可以重新运行模拟程序），但是如果您使用这些函数来创建安全密钥，那可实在是非常危险。

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She was still extremely pale, but her face had a curious tranquillity of expression that seemed drawn from some secret inner source.

她的脸色仍然非常苍白，但表情却出奇地平静，那平静仿佛来源于内心一种神秘的力量。

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The sad truth is that good fishing is always private, extremely expensive or a closely guarded secret.

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The secret lies in the extremely light and stiff composite material made of boron carbide in an aluminium matrix used for the engine.

ECONOMIST: CAR DESIGN

"It's extremely difficult for me to tell you the secret of anything, " says Bill Kalush, 47 years old, founder of the center.

WSJ: Years of Magical Thinking