Tại sao sân bóng đá có vạch sọc?
Các vạch sọc đậm nhạt xen kẽ mà bạn thấy trên sân bóng không phải là màu của hai loại cỏ khác nhau. Thực ra, toàn sân chỉ có một loại cỏ mà thôi.
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