M: (1)____________________________________________________________________.
W: Oh perfect, another piece of equipment that takes up lots of room.Don’t you think we have enough equipment to carry on our camping trips?
M：I know what you’re thinking,but if I find something that is both lightweight and useful,I think it’s worth having.This piece of equipment fits both those categories.
W：Well, how small is it?
M：It’s about the size of a pen!Just like the one you would use to write a letter.
W：Wow! I’m surprised.That’s pretty small. But how good is it at filtering the germs out of lakes or stagnant ponds?
M：It’s wonderful! It takes all the germs out of the water.(2)____________________________________________.
W：That’s amazing! But what if the water has dangerous chemical pollution in it?
M：Well, that’s different.The filter can’t remove dangerous chemicals or salts because the filters are not designed for that.To remove chemicals from the water would require a very sophisticated filter.It would be easier to boil the water and collect the steam if you were in that situation. But when you think about it,that’s not the major concern when you are out hiking in the wilderness. (3)_______________________________________________________________.
W：I guess you did find a good piece of equipment.
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作者: susan.sui 时间: 2014-9-30 11:10
I was just shopping around the new camping store down at the mall and found very useful device for the next camping trip---water filter
It has series of filter made of special chemicals that strain out all the harmful bacteria
the water in natural streams probably doesn't have poisionous chemical in it but it probably has dangerous bacteria from all the animals that live near the water作者: herman_liu76 时间: 2014-10-9 15:57
I was just shoping around the new camping store down of the mall, and I find very useful device for our next camping trip.water filter.
it has the serious of filter made of specal chemical that stream out all the harmful bacteiaria.
the water in natural streams probelly does not have poisons chemical in it.but it probelly has dangerous bactiria from all the animails that live near the water.
