PET bottle is polyethylene terephthalate referred to as PET. The PET bottles was developed to hold carbonated beverages. In 1973, DuPont acquired the patent of PET bottles.
The PET bottle has the characteristics of lightweight, impermeability, acid and alkali resistance, but low heat resistance. It will begin to deform over 80 degrees Celsius that should be used with caution. 
Don't put the high-temperature drink in it and don't exposure to sunshine. Never store the PET bottles in the car without air conditioning. 
The PET bottles may produce endocrine disruptors, also known as environmental hormone under certain conditions of use. It may also increase the attack rate of cancer. so we must pay attention to the correct method of use and avoid abuse. 
Since PET bottles cannot be naturally decomposed, how to deal with PET bottle rubbish has become an environmental issue that needs to be addressed in today's society.
The PET bottles can be recycled and reused. Be sure to recycle the PET bottle after use. Don't litter them to destruct the nature. 
我身後這棵高達17米以上的聖誕樹，是由7千個寶特瓶組成的。
寶特瓶是聚對苯二甲酸乙二酯（Polyethylene terephthalate）的簡稱PET，也就是寶特瓶這個名字的由來。
寶特瓶的誕生是由於開發能夠盛裝碳酸飲料的塑料瓶而研發出來的，於1973年由杜邦公司取得寶特瓶的專利。在塑料分類中，PET的代號是1號，我們可以在寶特瓶的瓶底看到標示。
寶特瓶具有韌性佳、質量輕、不透氣、耐酸鹼等特點，但是耐熱性低，超過攝氏80度就會開始變形，需謹慎使用。切勿裝高溫的飲料，也不建議曝曬於陽光下或儲存在沒有開空調的車內。
有研究指出，在某些使用條件下可能會產生內分泌干擾素，也就是所謂的環境賀爾蒙，除了會造成生殖系統的異常外，也會提高罹患癌症的機率，所以一定要注意正確的使用方法及避免濫用。
寶特瓶無法自然分解，所以如何處理寶特瓶垃圾的問題成為現今社會需要正視的環保議題。由於寶特瓶可以回收再製及再利用，所以呼籲大家一定要將使用過後的寶特瓶回收，切勿隨意亂丟，成為破壞大自然的殺手。
It's for the entry of Science Picture Challenge #1 held by @mcw.
這篇文章是參加 @mcw 舉辦的科學照片挑戰 #1，因為我不是科學研究開發的專業，所以只能參考網路上的資料，寫出很淺顯的內容，希望大家不要嫌棄。
Thanks for reading.
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