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����Ӣ�����ȴ�ѧJohn Swales ��ͳ�ƣ��Ƽ�Ӣ���е�ν����������֮һ�DZ���̬��������Ϊ�Ƽ����²������������ǿ���͹�׼ȷ����һ�����˳�ʹ�ù��࣬����������ܶϵ�ӡ����˾���ʹ�õ����˳����������ñ�����̬�����磺Attention must be paid to the working temperature of the machine.Ӧ��ע������Ĺ����¶ȡ�������˵��You must pay attention to the working temperature of the machine .���DZ���ע������Ĺ����¶ȡ����⣬��ǰ�������Ƽ����½���Ҫ��Ϣǰ�ã��������ﲿ�ݡ���Ҳ�ǹ㷺ʹ�ñ���̬����Ҫԭ���Թ۲첢�Ƚ��������ζ��ĵ����
We can store electrical energy in two metal plates separated by an insulating medium. We call such a device a capacitor, or a condenser, and its ability to store electrical energy capacitance .It is measured in farads.
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Electrical energy
Such a device
Its ability to store electrical energy
It (Capacitance )
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A direct current is a current flowing always in the same direction.
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Radiating from the earth, heat causes air currents to rise.
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A body can more uniformly and in a straight line,there being no cause to change that motion.
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Vibrating objects produce sound waves ,each vibration producing one sound wave.
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In communications, the problem of electronics is how to convey information from one place to another.
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Materials to be used for structural purposes are chosen so as to behave elastically in the environmental conditions.
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There are different ways of changing energy from one form into another.
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In making the radio waves correspond to each sound in turn, messages are carried from a broadcasting station to a receiving set.
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Archimedes first discovered the principle of displacement of water by solid bodies.
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����of displacement of water by solid bodies ϵ���ʻ��ṹ��һ�������ͬλ��Ӿ䣬��һ��ǿ��displacement ��һ��ʵ��
The rotation of the earth on its own axis causes the change from day to night.
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���ʻ��ṹthe rotation of the earth on its own axis ʹ���Ͼ�򻯳ɼ򵥾䣬����ʹ���ĸ������ȷ�����ܡ�
If you use firebricks round the walls of the boiler, the heat loss, can be considerably reduced.
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Television is the transmission and reception of images of moving objects by radio waves.
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���ʻ��ṹthe transmission and reception of images of moving objects by radio waves ǿ���͹���ʵ����"ν�ﶯ���������䷢��ͽ��ܵ�������

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The forces due to friction are called frictional forces.
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A call for paper is now being issued .
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In this factory the only fuel available is coal.
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In radiation, thermal energy is transformed into radiant energy ,similar in nature to light.
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The air outside pressed the side in .
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The force upward equals the force downward so that the balloon stays at the level.
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The results obtained must be cheeked .
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The heat produced is equal to the electrical energy wasted.
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During construction, problems often arise which require design changes.
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The molecules exert forces upon each other, which depend upon the distance between them.
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Very wonderful changes in matter take place before our eyes every day to which we pay little attention.
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To make an atomic bomb we have to use uranium 235, in which all the atoms are available for fission.
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