Examples
nǎ哪gè个bǐ jiào比较zhòng重，qiān铅hái shi还是huáng jīn黄金？
哪个比较重，铅还是黄金？
Which is heavier, lead or gold?
越来越多的环保者开始宣传和使用以环保的无铅汽油为燃料的汽车。
More and more environmentalists advocate and use environmentally friendly unleaded petrol in cars.
自来水有可能含有氯、铅等有害物质。
There's a chance that tap water may contain harmful substances like chlorine and lead.