under proper conditions,sound waves will be reflected from a hillside or other such obstruction. sound travels at the rate of about one-fifth of a mile per second. if the hill is eleven hundred feet away,it takes two seconds for the sound to travel to the hill and back.thus,by timing the interval between a sound and its reflection (the echo),you can estimate the distance to an obstruction.During World War 2the british used a practical application of this principle to detect German plances on their way to bomb london long before the enemy was near the target. they used radio waves instead of sound waves,since radio waves can penetrate fog and clouds. The outnumbered Royal Air Force (RAF) always seemed to the puzzled germans to be lying in wait at the right time and never to be surprised. it was radio echoes more than anything else that won the battle of britain.
since the radio waves were used to tell the direction in which to send the RAF planes and the distance to send them (their range of flight , in other words ),the device was called radio directing and ranging, and from the initials the word radar was coined.
A small crack appeared On a cocoon.
روزی سوراخ کوچکی در یک پیله ظاهر شد.
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A man sat for hours and watched
Carefully the struggle of the butterfly
To get out of that small crack of cacoon.
شخصی نشست و ساعت ها تقلای پروانه برای بیرون آمدن
از سوراخ کوچک پیله را تماشا کرد.
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Then the butterfly stopped striving .
It seemed that she was exhausted and couidnot go on trying.
آن گاه تقلای پروانه متوقف شد و به نظر می رسید
که خسته شده،و دیگر نمی تواند به
تلاشش ادامه دهد.
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The man decided to help the poor creature.
He widened the crack by scissors.
The butterfly came out of cocoon easily, but her body was
Tiny and her wings were wrinkled.
آن شخص مصمم شد به پروانه کمک کند
و با برش قیچی سوراخ پیله را گشاد کرد.
پروانه به راحتی از پیله خارج شد،
اما جثه اش ضعیف و بال هایش چروکیده بودند.
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The man continued watching the butterfly.
He expected to see her wings become her body.
But it did not happen!
آن شخص به تماشای پروانه ادامه داد .
او انتظار داشت پر پروانه گسترده و مستحکم شود
و از جثه ی او محافظت کند.
اما چنین نشد!
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As a matter of fact,the butterfly to crawl on
The ground for the rest of her life,
For she could never fly.
در واقع پروانه ناچار شد همه ی عمر را روی زمین بخزد
و هر گز نتوانست با بال هایش پرواز کند.
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The kind man did not realize that God had arranged the limitation of cocoon.
And also the struggle for butterfly to get out of it,
so that a certain fluid could be discharged from her
body to enable her to fly afterward.
آن شخص مهربان نفهمید که
محدودیت پیله و تقلا برای خارج شدن از سوراخ ریز
آن را خدا برای پروانه قرار داده بود،
تا به آن وسیله مایعی از بدنش ترشح شود
و پس از خروج از پیله به او امکان پرواز دهد.
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Sometimes struggling is the only thing we need to do .
گاهی اوقات در زندگی فقط به تقلا نیاز داریم.
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If God had provided us with n easy life to live without any difficulties,
Then we become strong,and could not fly.
اگر خداوند مقرر می کردبدون هیچ مشکلی زندگی کنیم،
فلج می شدیم ،به اندازه ی کافی قوی نمی شدیم و هرگز نمی توانستیم پرواز کنیم.
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I asked for strength,and He provided me
with enough difficulties
To become strong.
I asked for knowledge and He provided me
من نیرو خواستم و خداوند مشکلاتی سر راهم قرار داد، تا قوی شوم.
من دانش خواستم و خداوند مسایلی برای حل کردن به من داد.
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I asked for prosperity and promotion,
and He provided me with ability
to think and hands to work.
I asked for bravery ,nd He provided
Me with abstacles to overcome.
من سعادت و ترقی خواستم و خداوند به من
قدرت تفکر و زور بازو داد تا کار کنم.
من شهامت خواستم و خداوند موانعی سر راهم قرار داد،
تا آنها را از میان بردارم.
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I asked for motivation,and He showed me eople who needed help.
I asked for love and He provided me with opportunity
To give love to others.
من انگیزه خواستم و خداوند کسانی را به من نشان داد که نیازمند کمک بودند.
من محبت خواستم و خداوند به من فرصت داد تا به دیگران محبت کنم.
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I did not get what I wanted…..
But
I was provided with what I needed.
«من به آنچه خواستم نرسیدم...
اما آنچه به آن نیاز داشتم ،به من داده شد.»
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Donot worry,fight
With difficulties and be sure
That you can prevail over them.
نترس با مشکلات مبارزه کن
و بدان که می توانی بر آنها غلبه کنی