How to identify the inferior disposable tableware. Mr. Liu doesn't want to eat out in the cold weather recently. He often orders takeout, but he finds that some takeout boxes have quality problems and smell like poison. This is also a common concern of many working people.

　　據了解，一次性飯盒應由高純聚丙烯塑料制成。它們是圓的，半透明的，像米一樣的粒子，有彈性，能承受高溫，浸泡在正己烷和乙酸溶液中，不會發生反應。劣質的一次性飯盒氣味刺鼻;輕輕撕破;褶皺會出現白蠟;撕裂后易進水;熱會變形，還會有油水滲漏的現象。質量差的一次性筷子保質期長達4個月，之后可能會被細菌感染。市民在使用時，可以聞到筷子的味道，如果有硫酸味，更好不要使用。此外，用冷水清洗筷子表面可以減少殘留的二氧化硫。

　　It is understood that disposable lunch boxes should be made of high-purity polypropylene plastic. They are round, translucent, rice like particles, elastic, can withstand high temperature, immersed in n-hexane and acetic acid solution, will not react. The smell of inferior disposable lunch box is pungent; it is slightly torn; white wax will appear in the fold; it is easy to enter water after tearing; the heat will deform and there will be oil and water leakage. Poor quality disposable chopsticks have a shelf life of up to four months, after which they may be infected by bacteria. People can smell chopsticks when using them. If there is a smell of sulfuric acid, it is better not to use them. In addition, using cold water to clean the surface of chopsticks can reduce the residual sulfur dioxide.