Dùng năng lượng mặt trời làm lạnh đồ uống
Một công ty ở San Francisco vừa chế tạo ra hệ thống hộp kín nhỏ gồm 6 tấm pin mặt trời có thể cung cấp đủ điện năng để làm lạnh đồ uống và thực phẩm...
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