Always speak positively about past and present employers even if your experience has not been positive with them.
谈到过去和现在的雇主，永远要保持积极的口吻，哪怕你和他们处得并不好。
How can a new theory be evolved if it is not based on a summation of the practical experience of both past and present generations of scientists, both Chinese and foreign?
没有前人或今人、中国人或外国人的实践经验，怎么能概括、提出新的理论？
Past experience indicates that it is difficult to do well in this course if you do not attend class on a regular basis.
如果你不持续的上课，过去经验指出你很难把这堂课学好。
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