Another method is to place several cloth bags on top of each other in a box. Then a long wooden stick is used to slowly push a heavy cover down on the bags. Great pressure is produced in this way. Much greater pressure can be produced by using a machine，a hydraulic jack (液压千斤顶)．The greater the pressure is，the more oils will be produced.

　　Small presses are important in areas where electricity or gasoline cannot be used. They are also a good way to test if a local market for oils exists.

　　Small batch presses can be made of local materials. Their cost is low. They are not difficult to operate. And they are easy to repair. The small presses produce good quality oils. But the work is hard. And getting all the oil from the seeds can be difficult.

　　If there is a large supply of seeds，then hand-operated presses may not be enough to support a business. Large powered presses that can operate all day are needed.

　　Title How to (1) ______Oils from Seeds

　　(2) ______

　　of oils People use oils when they cook meals，paint pictures and clean objects.Method 1 ◆Crush the seeds between two stones and then put them into a cloth bag.

　　◆(3)_______ the cloth bag up. Some of the oil will flow out of the bag.

　　◆The (4)_______oil in the seeds can be got by putting more heavy rocks on them.

　　Method 2 ◆A box is used to (5) _______several bags of seeds.

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