Good textbooks are developed along the initiative. With the appearance of the bow and come to terms with the development of the natural environment and the social environment, the psychological state of the community property is not bound to stick with inappropriate technology and with the lives of real people, normal logged in Thailand as usual, such as bringing the bile or dilution water driven sewage back into the bile by the natural rhythm of the water or damaged by polluted water treatment water hyacinth, which is by nature, the absorption of dirt contamination in water, etc.
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