翻译句子

89.这个问题如此难没人能正确回答。

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90.这家飞行眼科医院已投入使用多久了？

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91.张医生习惯于在离家很远的地方工作。

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92.必须及时把这些字典归还到图书馆。

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93.当你去旅行时，随身带上地图和手机是必要的。

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People use money   86  food, books, bicycles and hundreds of other things they   87  .When they   88  ,they usually get paid in money.
Most of the money used today   89  metal or paper. But in ancient times people often used all kinds of things as money. One of the first kinds of money was shells（贝壳）.
In ancient China, cloth and knives   90  money. Elephant tusks（象牙）,monkey tails（尾巴）and salt were used in some parts of Africa. Rice was also a kind of money used by the ancient people on some islands. Cows and other animals were used as money. too.
The first copper（铜）coins   91  China. They were round and had a square（正方的）hole in the center. Different countries have used different metals for their money. Later some countries   92  to make coins of gold and silver（银）.But gold, silver and copper were heavy   93  when people needed a lot of coins to buy something expensive. The Chinese were the first   94  paper money. The first paper money didn’t   95  like the paper money we use today.

People use money    86  food, books, bicycles and hundreds of other things they   87  .When they    88  ,they usually get paid in money.

Most of the money used today    89  metal or paper. But in ancient times people often used all kinds of things as money. One of the first kinds of money was shells（贝壳）.

In ancient China, cloth and knives    90   money. Elephant tusks（象牙）,monkey tails（尾巴）and salt were used in some parts of Africa. Rice was also a kind of money used by the ancient people on some islands. Cows and other animals were used as money. too.

The first copper（铜）coins    91  China. They were round and had a square（正方的）hole in the center. Different countries have used different metals for their money. Later some countries    92  to make coins of gold and silver（银）.But gold, silver and copper were heavy    93  when people needed a lot of coins to buy something expensive. The Chinese were the first    94  paper money. The first paper money didn’t    95  like the paper money we use today.