由于Marangoni效应是很容易掩盖存在少量的表面活性杂质，应先检验是否有实验气液系统受到污染或不是。
As the marangoni effect is easily masked by the presence of a small amount of surface active impurities, it should first be tested whether the experimental gas-liquid system is contaminated or not.
这意味着活性炭过滤器会去除某些杂质同时忽视其他物质。
This means that an activated-charcoal filter will remove certain impurities while ignoring others.
金属催化剂是高活性的，但一旦它们发生了反应就很难分离出去，留下微小的杂质可能影响芯片的性能。
Metallic catalysts are highly active, but they're difficult to remove once the reaction is done, leaving small impurities that can nonetheless interfere with a chip's performance.
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