The data to be translated: Google announced on their security blog that Gmail's spam filtering feature has undergone the most significant upgrade in recent years. The new text classification system, RETVec, is capable of effectively identifying and handling "adversarial text manipulation." This technology upgrade makes spam containing special characters, which was previously difficult to identify, no longer a problem. It not only identifies direct spam but also handles more complex situations. The efficiency of RETVec is demonstrated in its resilience to character-level manipulation and its applicability to multiple languages. Google stated that by replacing the original text vectorizer with RETVec, the spam detection rate has improved by 38%, and the false positive rate has decreased by 19.4%.