这在要求保护稀有合金的情况下或在高温井中是特别必需的。
This is necessary particularly in applications requiring the protection of exotic alloys or in high-temperature Wells.
在一个案例中，业内高管发现一种号称纯金的涂层其实是一种复杂的合金，含有锇、铱、钌、铑等稀有金属。
In one case, executives discovered a coating advertised as pure gold that masked a complex alloy, which included rare metals such as osmium, iridium, ruthenium and rhodium.
其它的利用太阳光分解水的方案依赖于腐蚀性溶液或者相对稀有且昂贵的材料比如铂合金。
Other attempts to produce devices that could use sunlight to split water have relied on corrosive solutions or on relatively rare and expensive materials such as platinum.
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