Trial and error are the source of our knowledge.
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You have to condemn yourself severely and describe your error vividly in the letter.
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Trial and error are the source of our knowledge.
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We are very glad to send you with this letter a copy of our catalogue for digital cameras. The high quality of our product is well-known and we are confident that a trial order wound convince you our goods are excellent.We are offering you goods of the highest quality on unusually generous terms and would welcome the opportunity to serve you. We expect a lot of people to come in and look around without buying anything the first time.
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8、精密度是与“真值”之间的一致程度，是系统误差与随机误差的综合。 Precision is the degree of consistency with "true value", and is the synthesis of systematic error and random error.
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