Older homes may have lead pipes, but even new plumbing that's leadfree can still contain lead in brass fitting or faucets or in copper pipes with soldered joints.
旧的家庭用的是铅管，但是即使是新的无铅水管装置在焊接接头的铜管件或水龙头或铜管中也含有铅。
2
With the improved?living conditions, people lead a stable and trouble-free life.
随着生活条件的改善，人们过上了稳定的、没有烦恼的生活。
3
Rhenium is used to make high-temperature alloys for jet engine parts and in high-octane, lead-free gasoline.