. Keep proper nouns: Bitcoin, MACD, SMA. For "200-day simple moving average" first mention, use full translation then later can use "SMA 200 ngày" for brevity. But in first paragraph, we used full. In second paragraph, we used "đường trung bình động đơn giản 200 ngày" again? Actually second paragraph is about MACD. Third paragraph uses "200-day simple moving average" again - we can use "đường trung bình động đơn giản 200 ngày" then later "SMA 200 ngày". But to be consistent, we can use "SMA 200 ngày" after first full explanation. However, the article itself uses "200-day SMA" later. So we can mirror: first mention full, then "SMA 200 ngày". In Vietnamese, it's common to keep SMA as abbreviation. I'll do: first paragraph: "đường trung bình động đơn giản 200 ngày (SMA 200 ngày)" but that might be too wordy. Alternatively, just "đường SMA 200 ngày" is fine as many Vietnamese readers know SMA. But requirement says use appropriate Vietnamese terminology. I think "đường trung bình động đơn giản 200 ngày"
