... “Vòng quanh”!
PTO- Khi còn đi học phổ thông, bài học về sự ngưng hơi nước trong môn Vật lý "Nước đi vòng quanh" rất khó quên bởi lý giải đúng bản chất hiện tượng bốc hơi, ngưng đọng hơi nước thành mây tạo mưa ...
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