Water Problems in the F 600字高中英语作文
presently, the world is faced with serious water problems. but these problems witt become more intense and more complex in the future. our increasing population witt tremendously increase urban waters, primarily sewage. on the other hand, increasing demands for water witt decrease substantially the amount of water available for diluting wastes.
rapidly expanding industries which involve more and more complex chemical processes will produce large volumes of liquid wastes. many of thesewitt contain chemicals that are poisonous. to feed our rapidly expanding population, agriculture will have to be intensified.
this will involve ever increasing quantities of agriculture chemicals. from this, it is apparent that drastic steps must be taken immediately to develop corrective measures for the pollution problems.
there are two ways by which these pollution problems can be lessened. the first relates to the treatment of wastes to decrease their pollution hazard. this involves the processing of solid wastes "prior to" disposal and the treatment of liquid wastes to permit the reuse to the water or best reduce pollution upon final disposal.
the second approach is to develop an economic use for all or part of the wastes. farm manure is spread in fields as a nutrient. wastes from sewage disposal plants are used in some areas both for irrigation and for the nutrients contained.
liquid wastes from other processing plants may also be used as a supplemental source of water. only by doing these promptly now can we expect to solve the serious water problems in the future.
暑假计划英语作文3篇
How I Spent My Summer Vacation
The summer vacation had come round again. I was happy that I could forget about school at least for a while. Lest I fool around all through this summer vacation, I made a plan as to how to spend it. First, I thought I should go over all those things my teachers taught in the previous term so that I could have a better understanding of them. Then I thought I should take up some forms of exercise, such as walking, running and rowing, to keep me physically strong. It stood to reason that with such a good plan I should make the best of my vacation time. I did, because I lived up to what I had planned.
How I Spent My Summer Vacation(2)
Summer can be very hot in southern Taiwan where the temperature usually goes up to 32"C or more. Because of the heat it is a trying experience to go to school or do anything else in a place that is not air-conditioned. Also because of this I stay at home most of the time during the summer vacation and only occasionally go to the beach to plunge myself into the cool water as a way to keep my body less sticky. Actually I like swimming and think nothing is more refreshing than a swim. In the summer vacation that has just ended I went swimming many times with my classmates and we all had a good time. This summer vacation, however, was not spent entirely in seeking fun. As a second-year senior student I had to prepare myself for the college entrance examinations that were only a year away. In other words, I must find time to study, too. So I pided my time between work and play during the summer vacation and derived much benefit from this arrangement.
How I Spent My Summer Vacation(3)
I spent this summer vacation in quite a different way. I used to run about every day in previous summer vacations, but this summer vacation I simply could not afford to do so. I would soon be in the last year of my high-school education and would after graduation be up against the college entrance examinations. Though those examinations were still a year away, I had to start early to make myself well prepared by reviewing all those things I had learned at school and this summer vacation was the ideal time for me to do this. At first I was rather dismayed at the thought of this, but later I thought it was better this way because by working hard this summer I could count on endless happy summers to come. With this in mind I then set to work like anything and only occasionally went out for a change or did some physical. I was not at all bored by this kind of life, for I was sustained by a hope.
