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Time is abstract. We can not see and touch it. Once it passes
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by, it will never return back again. Everybody now makes full use
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of time. Take our everyday's life for example. Farmers plough the
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fields and harvest plants in time. Workers work hard from morning till
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evening. Students study hardly from Monday to Friday. Scientists spend
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every minute do their researches.
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Everyone knows what time is life. Because life is very short,
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we should never waste any time. We have to study hard so that we can't
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serve for our society in the future. We must form good habits; never leave
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today's work until tomorrow. Only by this way can we succeed.
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Fish get their oxygen direct from the water.

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They have organs calling gills(Èú) that take oxygen

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out of the water. But water can run out of oxygen,

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just like air can. So fish can suffocate(ÖÏÏ¢) in

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water£­which means they can drown!

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These drownings occur most often in small ponds

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that dries up. All the fish in the pond are crowded

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into the remaining water, which they use up all the

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oxygen in the water, then drowned. Fish can also drown

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if its gills are damaged. Weather conditions also cause

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drownings. When oxygen supply in the water is very

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low the fish raise to the surface and suck air. But

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in cold weather, when the surface is freezing, the

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fish can't reach that air, and so drown.

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