Long Using Life: under the rated temperature and pressure, PE pipes may be used for over 50 years.
长久的使用寿命：在额定温度、压力状况下，PE管道可安全使用50年以上。
Life-long PE, a lively and puzzling subject in school PE, is discussed in this thesis through PE courses, teaching arrangement as well as measures and examination.
终身体育，是学校体育在永久性话题中既充满活力又不少困惑的课题。本文就体育课程，教学组织与方法，成绩检测等方面的问题，从终身体育的视角谈一点认识。
Long service life: at rated temperature and pressure conditions, PE tube can be safely used for more than 50 years.
长久的使用寿命：在额定温度、压力状况下，PE管道可安全使用50年以上。
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