Here's a decent rule of thumb: High-tech products like electronics usually aren't so bad, while products like leather and glass tend to be associated with a lot more pollution.
在此提供一个不错的经验之谈：高科技产品诸如电子之类的都还不错，而皮革和玻璃制品则会制造大量的污染。
2
The rule of thumb is to drink six glasses of water for every glass of alcohol.
经验法则是喝1杯酒要喝6杯水。
3
A general rule of thumb for conventional room-temperature cured polyesters is 1/32 inch of shrinkage per linear foot when reinforced with 25 weight percent glass content.