According to estimation of bureau of American country scene, if the ice of lake face is clear, had trampled without how many person again, want 15 centimeters only thick can bear one the individual's weight, 60 centimeters thick can bear a car or a light-duty lorry. If be the ice that Chu Dongxin writtens guarantee, ply wants double ability security.

What is the insect with the most powerful force is being destroyed on ▲ world?

Desert locust perhaps is foregone destruction the insect with the most powerful force (be in one kind " Bible " in has mentioned locust) , the drought in Africa, middle east and India and half drought region appear and disappear. Appetite of this kind of locust is very big, what eat alimental weight to be equivalent to his weight everyday. Locust of one swarm desert can eat off 20 thousand tons of plants one day.

What is the “ floater ” in ▲ your eye?

That is the translucent particle in eye shot. Among them a few come free retina is hemal commentate the erythrocyte that go out, form banding, in float all round retina. The shadow —— vitreous body that most floater is a few small fragments inside vitreous body actually is a kind of transparent jelly pledges, cram the eye is in-house. If suddenly new floater appears, eye shot brim has bright glitter again, that may be retinal burst or fall off.

What disease is the disease with the commonnest ▲ ?

The commonnest contagion is nose catch a cold, namely common catch a cold. The commonnest in blame contagion is periodontosis, for example gum is phlogistic. Very few person can be done not have all one's life had sufferred from periodontosis.



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