The Pope is visiting Russia.
The moon is very bright tonight.
The Shah of Iran was deposed in 1979.
He is the tallest boy in the class.
It is the oldest building in the town.
because there is only one in that place or in those surroundings:
A woman who fell 10 metres from High Peak was lifted to safety by a helicopter. The woman fell while climbing.一个女人从高峰上向下摔了10米，直升飞机将其救起。这个女人是正在登山的时候掉下来的。
The rescue is the latest in a series of incidents on High Peak. In January last year two men walking on the peak were killed in a fall.这次救援是在高峰上发生的一系列事故中最近的一次。在去年的一月，两个男人在登山时坠落身亡。
The wolf is not really a dangerous animal (= Wolves are not really dangerous animals)
The kangaroo is found only in Australia (= Kangaroos are found only in Australia)
The heart pumps blood around the body. (= Hearts pump blood around bodies)
Joe plays the piano really well.(= George can play any piano)
She is learning the guitar.(= She is learning to play any guitar)
Life can be very hard for the poor.
I think the rich should pay more taxes.
She works for a group to help the disabled.
The definite article with names:
William Shakespeare wrote Hamlet.
Paris is the capital of France.
Iran is in Asia.
the United Kingdom; the kingdom of Nepal; the United States; the People’s Republic of China.
the Netherlands; the Philippines
the Himalayas; the Canaries; the Atlantic; the Atlantic Ocean; the Amazon; the Panama Canal.
The Times; The Washington Post
the Empire State Building; the Taj Mahal; the Mona Lisa; the Sunflowers
the United Nations; the Seamen’s Union
the Ritz; the Ritz Hotel; the King’s Head; the Déjà Vu
the Obamas; the Jacksons