Okay, the user wants me to translate "sand timers" into Vietnamese. Let me check the rules again. The first rule says to translate all content into Vietnamese. The second rule states that if the content is already in Vietnamese, leave it unchanged. The third rule is to provide only the translation without explanations.
So, "sand timers" is in English. I need to translate it. The direct translation would be "đồng hồ cát" in Vietnamese. Let me confirm that "sand timers" refers to the hourglass used to measure time. Yes, "đồng hồ cát" is the correct term. I don't see any reason to change it. The user might be looking for a simple translation without any additional information. Since the original is in English, I should output the Vietnamese translation as per the rules. No explanations needed. Just the translation result.
đồng hồ cát
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