西伯利亚虎——亦称东北虎——在上世纪中期几乎灭绝，当时数量降低到了50头以下，不过现在据信有400头野生的西伯利亚虎。

The Siberian tiger - also known as the Amur tiger - nearly went extinct in the middle of the last century, when Numbers fell below 50, but there are now thought to be more than 400 left in the wild.

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不久，虎兄收到一封信。信中除了一个问号以外，什么字也没有。

Soon, the elder tiger received a letter in which there was nothing except a question mark.

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虎弟接到信以后，十分向往，决定到城里去看一看。

Having received the letter, the younger tiger decided to go to the town, longing for that kind of life.

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