1·Check that joints are secure and the wood is sound.
检查接头是否牢固，木头是否完好。
—— 《柯林斯英汉双解大词典》
2·Older homes may have lead pipes, but even new plumbing that's lead free 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。
3·By far the most popular plastic, polyethylene is used in grocery bags, artificial joints and plastic bottles. It's even found in chewing gum.
由于塑料得到大家喜爱，因此聚乙烯被广泛用于食品包装、人工接头和塑料瓶，它甚至可以用于制造香口胶。
4·The interrelationships of these four separate variables are somewhat similar to a four-sided frame with flexible joints.
这四个分离变量的相互关系有点像带有柔性接头的四边形框架。
5·It is advisable to fit all the ground glass joints with polytetrafluroethylene sleeves to prevent their sticking together .
最好把所有的磨光玻璃接头都装上聚四氟乙稀套管，以防止它们粘在一起。