应该是第1个!
（1）金属钛和铜合金 Ti and Cu-alloys
（2）钛合金和铜合金Ti- and Cu-alloys 或者Ti-alloys and Cu-alloys小横杠是必不可少的!
（3）钛铜合金Ti-Cu Alloys
其他应用包括金属钛和铜合金的加工、制陶业和塑料/复合物.
多元复合合金这样表达Ti-Cr-Cu Alloys 加一种就添一个小横杠.
关于and的译法,Other applications include the machining of Ti and
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