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.
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.
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.
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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