The properties change under an accelerated ageingcondition of PET were studied.
研究了PET材料在加速老化条件下性能的变化。
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As the UK National Health Services explains, for years, dermatologists have been noticing that people who have had acne show signs of ageing later than those who have never had the skin condition.
The tests of curing condition, resistance to medium and hydrothermal ageing showed that the J-200-1D adhesive has excellent processing properties and resistance to weathering.