I can kind of see the logic. It&#x27;s certainly <i>possible</i> for an adult to learn to speak another language indistinguishably from a native speaker, but in practice there&#x27;s a surprisingly large gap between that and a person who can speak fluently on complex subjects with no fear of being misunderstood, but makes occasional minor errors--or even usages which are grammatically correct, but <i>sound</i> stilted--that betray them as non-native.<p>There&#x27;s a big jump between 99.9% and 100%, is what I&#x27;m saying, and if you want a really professional translation job, you&#x27;re not going to settle for 99.9%. And the thing is, you can&#x27;t tell the difference between 99.9% fluent and 100% fluent without <i>being</i> 100% fluent. So if you want to be sure you&#x27;re getting 100% fluency, a native speaker is your best bet.