71.  From 1960 to 1990, great changes about health have taken place in developing countries.

72.  It can be seen from the above pic that two obvious changes took place in health gains in developing countries betwen 1960 to 1990.

73.  They don't move here and there, settling themselves in a certain place.

74.  Therefore, with the development of secity geat change has take place, and Life expectancy and infant mortality in developing countries have also changed much.

75.  As the developing countries progress, great changes have taken place.

76.  These changes taken place result from two important reasons.

77.  Great changes had taken place in life exectancy and infant mortality in developing countries from 1960 to 1990.

78.  We can learn that a lot of changes have taken place in both life expectancy and infant mortality in developing countries from 1960 to 1990 from the chart.

79.  From the diagram, we are able to learn that great changes had taken place in health gains in developing countries from 1960 to 1990.

80.  From this instretion , we can find that great change has taken place on the life expectancy and infant mortaility in developing countries.